Internet-Cellular

Marine Cellular Internet on a Ranger Tug R27

We've been running internet on our Ranger Tug R27 since 2021, which enables me to work from the boat. Cellular handles 90% of what we need. Starlink handles the rest. This is the upgraded setup we run today, the install decisions behind it, and what it actually costs to run.

TL;DR

Primary connection: Peplink AntennaMAX with a Peplink MAX BR1 Pro 5G router mounted inside the antenna at the top of the mast
Two SIMs: T-Mobile (San Juan Islands) and AT&T (Canada and SE Alaska)
Failover: Starlink when plugged in, marina guest Wi-Fi when docked, cellular everywhere else
Power draw: 8 watts cellular vs ~45 watts for Gen 2 or Gen3 Starlink setup.
Real-world throughput: 300+ Mbps benchmarked over 5G/LTE
Use case: working from boat, Blink security cameras, Victron remote management, streaming YouTube under way

What Changed: The Router Moved Up the Mast

The previous setup used a separate Peplink Mobility 42G antenna on the mast with the BR1 Pro 5G router mounted inside the boat. That works, but it leaves performance on the table. Every foot of coax cable between an antenna and a modem costs you signal, and at 5G frequencies (n77 / n41 around 3.5 GHz) the loss is brutal. A 20 foot run on LMR-400 class cable can eat 5 to 8 dB before the signal ever reaches the modem. That loss applies in both directions, transmit and receive.

The Peplink AntennaMAX solves that by putting the router inside the antenna housing. The radio is millimeters from the antenna elements. The only cables coming down the mast are Ethernet (no RF loss) for DC power and to Starlink. That's it. This is the same design philosophy the carriers use on their towers (remote radio heads), just packaged for boats and RVs.

Why Cellular First, Starlink Second

We run cellular as the primary and Starlink as the backup, not the other way around. There are four reasons:

1. Cellular runs on 8 watts. The BR1 Pro 5G pulls 8 watts. My Gen 2 Starlink, once converted to 12 volts DC, draws 28 watts. That's a meaningful number, especially anchored out for multiple nights.

2. Saltwater and a non-rated dish is a bad combination. The AntennaMAX is IP67 rated. My Gen 2 Starlink is not waterproof (It's weather resistant). The Gen 3 dish is waterproof, if you're starting fresh.

3. 5G coverage is still expanding. I've benchmarked 300+ Mbps in normal cruising waters. For an inter-coastal cruiser, that's plenty. Most of the time it benchmarks around 100mbs.

4. Cellular surprises you in remote places. I had cellular coming around Cape Caution, across the Dixon Entrance, and out in front of Tracy Arm. My phone said "no service." The Peplink, with a high-gain antenna 12+ feet up, did not. The reason is power and antenna pattern, which I'll get to.

When we need Starlink (truly off-grid), I plug it in and the router automatically prefers Starlink over cellular.

The Hardware

Pepwave MAX BR1 Pro 5G router (Peplink rebranded their accessory line to Pepwave starting 2026, same product). Two SIM slots, single modem. The router picks which carrier to use based on signal strength and configurable rules.
Peplink AntennaMAX (also being rebranded to Pepwave AntennaMAX in 2026). IP67 enclosure with 4x4 MIMO 5G/LTE antennas, 2x2 MIMO Wi-Fi, and a GPS element. Operates from -40°C to 80°C. The router lives inside the housing.
A new clamshell on the starboard side of the cabin top, because the factory port-side clamshell didn't have room for three additional cables (two Ethernet, one Sirius XM).
A Sirius XM antenna at the top of the mast next to the anchor light, since I had the mast and clamshell open anyway.

The factory TV/UFO antenna came off the mast to make room. We don't watch broadcast TV. We watch YouTube, and we now stream it under way.

One install detail people miss: the mast on a Ranger Tug folds down for trailering. Even though the new clamshell is on the starboard side, every cable run had to be planned so the mast still folds to port without binding. If you're doing this install yourself, lay it out and dry-fold the mast before you commit to a single cable route.

Note for buyers shopping right now: Peplink released a new BR1 Pro 5G variant in October 2025 with the Qualcomm X65 modem at the same $999 price as the older X62 version. If you're buying new, get the X65. It's a meaningful spec bump on 5G mid-band performance.

If you want to source this gear, Onboard Wireless is our affiliate partner. Use csurf.co/wifi to order. Full details and disclosure at the bottom of this post.

Where to Mount the Antenna (and Where Not To)

Two rules:

Keep the antenna out of the radar beam. Radar acts as a reflector and obstruction at cell frequencies. Mount the cell antenna above the radar beam, not in it.

Get it as high as you reasonably can. The propagation argument here is straightforward: mounting height extends the radio horizon. Cell signals travel best with line of sight to the tower. Every foot of mast height extends the distance you can see a tower, especially across open water where there's nothing else in the path.

The side benefit of mast-top mounting is that you can put the router right there, eliminate the cable loss problem entirely, and let the antenna do the work it was designed to do.

How High-Gain Antennas Actually Work

There's a common misconception that a high-gain antenna gives you "more power." Antennas are passive. They don't add power. What a high-gain antenna does is reshape the radiation pattern, focusing the energy you already have into a tighter beam.

Think of a flashlight with an adjustable focus. Same battery, same bulb. Wide beam lights up the floor at your feet. Narrow beam reaches across a parking lot. Same total energy, focused differently.

For a boat antenna, the goal is to flatten the beam horizontally, toward where the cell towers are (on land), instead of letting energy radiate uselessly up into the sky or down into the water. That's what gain figures in dBi describe. Every 3 dB doubles the effective power in the beam direction.

Cell towers have plenty of transmit power and big antennas. Your modem doesn't. What kills your data session in marginal coverage isn't usually the tower's signal reaching you. It's your modem failing to talk back. A high-gain antenna up the mast solves that.

Carrier Strategy: T-Mobile and AT&T, Both

Two SIMs, one modem. The router picks whichever has better signal at the time, with rules I can tune (signal threshold, monthly data cap, billing priority).

T-Mobile wins in the San Juan Islands. T-Mobile bought 600 MHz spectrum at auction in 2017 and started deploying Band 71 in 2019. 600 MHz travels significantly farther than mid-band 5G frequencies. For rural and coastal coverage, T-Mobile Band 71 is hard to beat right now.
AT&T wins in Canada and SE Alaska. Different roaming agreements, different tower density. In British Columbia and SE Alaska, AT&T was consistently the carrier delivering coverage where my phone showed "no service."

For around $50/month per carrier, redundancy is cheap insurance.

Failover Priority

The Peplink router is configured with a clear hierarchy:

Starlink (WAN port) — if the dish is plugged in, use it
Marina guest Wi-Fi (2.4 GHz WAN) — if Starlink is unplugged and we're docked, connect to marina Wi-Fi through the high-gain antenna
Cellular — if neither is available, run on whichever SIM has the best signal

When Starlink unplugs, the router falls through to marina Wi-Fi. When that's not available, it's on cellular. The handoff is automatic. The only manual step is plugging in the Starlink cable.

Marina Wi-Fi via the mast-top antenna is underrated. You're pulling in the marina's guest WIFI network from 12+ feet up with a high-gain Wi-Fi antenna instead of fighting from inside the cabin. We use this any time we're a transient guest at a marina. Saves cellular data at zero cost.

Reading Signal Quality

The Peplink dashboard shows RSRP, RSRQ, and SINR for the active SIM. Knowing what those numbers mean is the difference between "the internet feels slow" and knowing what's actually happening.

RSRP (signal power):

-80 or higher = excellent
-80 to -90 = good
-90 to -100 = mid-cell
-100 or lower = cell edge

RSRQ (signal quality):

-10 or higher = excellent
-10 to -15 = good
-15 to -20 = mid-cell
lower than -20 = cell edge

SINR (signal vs noise):

20 or higher = excellent
13 to 20 = good
0 to 13 = mid-cell
0 or lower = cell edge

If you have an iPhone and want to see the same numbers on your phone, turn off Wi-Fi and dial 3001#12345#. That opens Field Test Mode. Useful for comparing what the Peplink reports vs what your phone sees.

When we drop anchor in a new spot, I check these numbers first. If RSRP is at -100 and SINR is below 5, I'm probably not getting useful throughput regardless of what the carrier dashboard says about coverage in the area.

What We Actually Use It For

Working from the boat. I've worked remotely since 2011. Now my office moves with me. We can run multi-day video calls from anchor.
Blink security cameras. Always-on cellular keeps the cameras reporting whether we're at the marina or anchored out.
Victron remote management. I can check house battery state of charge, solar production, and shore power status from anywhere with a phone signal. If something's wrong on the boat, I know about it before it becomes a problem.
Streaming. YouTube under way is now normal. No buffering at 25 knots in normal coverage.

The Honest Tradeoffs

Heat. A sealed plastic enclosure mast-top in direct summer sun, with an 8-watt router inside running 24/7, is a thermal management problem. Field reports on this product flag it. I'm collecting data this season. If the modem throttles or the throughput drops on hot, sunny days, I'll publish what I see. Don't take "8 watts is nothing" at face value if your boat sits in unshaded slip storage in summer.

Cellular still has dead spots. Cape Caution and Dixon Entrance worked. Some narrow inlets and tight fjords didn't. Cellular is line-of-sight to a tower. When you're behind a 3,000 foot rock wall, no antenna gain saves you. That's what Starlink is for.

Cost. The hardware ran north of $1,500 plus install time. One SIM at $50/month is $600/year. Starlink at $50/month for the months we activate it is another few hundred. This isn't a cheap setup. It's a working setup. I also had to add shrouds to the mast to stabalize it for the additional weight being added. Shrouds added another $400 in parts plus install time.

Single modem. The BR1 Pro 5G has two SIM slots but one modem, so you're using one carrier at a time. If you need true bonding (using both SIMs simultaneously), you need a dual-modem router. Peplink makes them. They cost more.

What's Next in the Peplink Lineup

For anyone reading this and shopping fresh, two newer options worth knowing about:

Peplink AntennaMAX S (~$699 MSRP). Same all-in-one concept, but the housing also mounts a Starlink Mini directly. One mast-top unit, cellular and satellite combined, single PoE cable down. If you're starting from scratch and committed to running both Starlink and cellular, this consolidates the install dramatically.
Peplink AntennaMAX Duo. 8x8 MIMO with dual modems for bonded cellular. Overkill for my needs, but if you need it, you need it.

I'm staying on the original AntennaMAX with my BR1 Pro 5G. The math on swapping to AntennaMAX S only changes if I decide to run Starlink Mini permanently mounted, which I haven't. Pulling Starlink out of the lazarette and plugging it into the cockpit in port still works fine for our use case.

Performance Data Coming This Season

I'm collecting before/after RSRP, RSRQ, SINR, and throughput data at the same anchorages we visit every year. We have years of cellular performance data on the previous setup (separate antenna with cable runs). The new setup (router in the antenna) should show measurable improvements in the same locations. When the data is in, it goes here.

This is the kind of question dealers can't answer and forum posts won't measure. If you want the numbers, subscribe and they'll show up in your inbox when they're ready.

I've Installed This Setup on Other Boats

I've put this setup (or close variants) on several R29-CBs, several R27s, and an R25. If you're a Ranger Tug owner thinking about this and want help figuring out the right configuration for your boat, get in touch.

Shopping This Setup

If you're putting this together for your own boat, Onboard Wireless is our affiliate partner for Peplink and Pepwave hardware. Use this link to order the BR1 Pro 5G, the AntennaMAX, the AntennaMAX S, the AntennaMAX Duo, or anything else in the lineup:

👉 csurf.co/wifi

It costs you nothing extra and it helps support the channel.

Disclosure: Onboard Wireless is one of our affiliate partners. We earn a commission when you order through our link. The price you pay is the same. We only recommend gear we actually run on our own boat.