Outbuilding

MoCA

MoCA Over Existing Coax

If a coax cable already runs between the two buildings, a pair of MoCA adapters gives you gigabit+ ethernet over it.

Affiliate disclosure. As an Amazon Associate, Outbuilding Internet earns from qualifying purchases. Product links in this guide may earn us a commission — at no extra cost to you.

MoCA (Multimedia over Coax Alliance) pushes ethernet traffic over existing coaxial cable — the same cable that carried TV or cable-internet. If you already have coax running between your house and an outbuilding (even from a long-disconnected satellite dish), a pair of MoCA adapters turns it into a 2.5 Gbps ethernet link with zero digging, no line-of-sight requirements, and about ten minutes of install work.

It is by far the easiest outbuilding internet install — if the coax is already there.

Is MoCA right for you?

Pick MoCA if
  • Coax already runs between the two buildings. Satellite lines count. Old cable-TV runs count. Disconnected coax counts.
  • You want gigabit+ throughput with almost zero install work.
  • You don't want to deal with line of sight, aiming, or outdoor radios.
Skip MoCA if
  • No coax exists between the buildings. Pulling new coax just for MoCA makes no sense — run ethernet or fiber instead.
  • The coax is badly degraded — nicked from weed-whackers, water-logged, or passed through cheap splitters. We cover diagnostics below.
  • You need more than ~1,000 ft of coax between the buildings.

How MoCA works

Each MoCA adapter has a coax input and an ethernet output. Plug one adapter on each end of your existing coax, plug each ethernet port into your network, and the pair silently carries traffic over the coax using frequencies above the TV/cable-internet band. Your existing cable TV or internet service on the same coax keeps working.

The core gear

The adapters: ScreenBeam Bonded MoCA 2.5 (2-Pack)

Actiontec's ScreenBeam ECB7250K02 is the default pick. MoCA 2.5 bonded, 2.5 Gbps ethernet ports, two ends in one box. There are other MoCA 2.5 brands (goCoax, Motorola), but ScreenBeam is what most people land on for reliability and firmware support.

Actiontec ScreenBeamMoca Adapter~$160

Actiontec ScreenBeam Bonded MoCA 2.5 Adapter, 2-Pack (ECB7250K02)

Turn existing coax into a 2.5 Gbps ethernet backbone.

If your house and outbuilding are already connected by a run of coax (old TV cable, satellite, etc.), a pair of MoCA 2.5 adapters gives you up to 2.5 Gbps between them with zero digging. The ECB7250K02 ships as a starter kit with both ends in the box.

Best for: Properties with existing coax between buildings.

  • No line-of-sight needed
  • No digging
  • Near-2.5 Gbps throughput
  • Both ends included
  • Requires existing coax
  • Signal quality depends on cable/splitter condition
Standard
MoCA 2.5 (bonded)
Throughput
Up to 2.5 Gbps
Ports
1x 2.5 GbE
Check on Amazon

The $10 filter: PPC MoCA PoE Filter

Install this filter where your coax enters the house from the street, if any part of your coax network is still connected to a cable-company service (Xfinity, Spectrum, etc.). It blocks MoCA signals from leaking onto the cable company's network and blocks external interference from leaking in.

Skip this if your coax is completely isolated — e.g. a disconnected satellite-only run.

PPCMoca Adapter~$10

PPC SNLP-1GCW MoCA PoE Coax Filter

$10 filter that keeps your MoCA signal off the neighborhood.

Screws onto the coax where it enters your house from the street. Blocks MoCA frequencies from leaking onto the cable company's network and absorbs interference from outside. Install one if you have any active cable-TV / internet coax service.

Best for: Any MoCA install on a house still connected to a cable provider.

  • Cheap insurance
  • Improves throughput and stability
  • Five-minute install
  • Easy to forget
Check on Amazon

Build your shopping list

MoCA is simple — most installs only need the adapters and a filter. The optional items below add Wi-Fi and extra ports at the destination.

Build your shopping list

Check off what you already own — we'll tailor the list to what's left.

Still need to buy(4 items)

~$173 total
PPC · ~$10
PPC SNLP-1GCW MoCA PoE Coax Filter
$10 filter that keeps your MoCA signal off the neighborhood.
Amazon
Ubiquiti · ~$29
Ubiquiti UniFi Switch Flex Mini (USW-Flex-Mini)
5-port managed gigabit switch the size of a credit card.
Amazon
Ubiquiti · ~$99
Ubiquiti UniFi 6 Lite Access Point (U6-Lite)
Default UniFi AP for inside the barn.
Amazon
Ubiquiti · ~$35
Ubiquiti PoE+ Adapter 30 W (UACC-POE+-2.5G)
Default UniFi PoE+ injector. 2.5 GbE, 30 W, Wi-Fi 6-ready.
Amazon

Prices are approximate. As an Amazon Associate we earn from qualifying purchases.

Install: step by step

1. Trace your coax

Confirm the coax actually goes from house to outbuilding. Follow the cable at both ends and identify the two RF connectors you'll plug into.

2. Check coax health

The quickest health check is the MoCA adapters themselves — if the adapters don't link after install, your coax is the problem. Common killers:

  • Corrosion at connectors (green fuzz). Cut and re-terminate with new compression F-connectors.
  • Water-logged buried coax. Kinks, brittle jacket, or simply no signal through the line. Replace with direct-burial quad-shield RG-6.
  • Bad splitters. Standard TV splitters top out at 1,002 MHz and will block MoCA's 1,125–1,675 MHz band. Replace with a MoCA-rated splitter (5–1,675 MHz passband).

3. Install the PoE filter (if needed)

Find where cable-company coax enters your house. Screw the filter on between the incoming line and whatever's inside. There's a "to street" arrow on the filter — direction matters.

4. Plug in the adapters

  • House end: coax into the MoCA adapter, ethernet into a LAN port on your router, plug in power.
  • Destination end: coax into the other adapter, ethernet into your switch / AP / device, plug in power.

Wait 30 seconds. Both adapters auto-pair. Look for the link LED.

5. Test throughput

Run a speed test from a device on the destination side. Getting close to your home internet speed = you're done. Seeing 50–100 Mbps when you expected 500+ = splitter or coax issue.

Troubleshooting

Link LED off. Broken coax run, or a splitter blocking MoCA frequencies. Sanity check: connect both adapters via a 6 ft coax jumper. If they link, the problem is in the long run or its splitters.

Link up, throughput terrible. Splitters that don't pass MoCA. Swap to MoCA-rated ones. Second most common: corroded coax. Third: two MoCA networks on the same coax without distinct passwords.

Drops at certain times of day. Cable-company interference leaking onto your coax. Install the PoE filter.

Cost vs. point-to-point

A MoCA install is typically ~$170 just for the backhaul, or ~$330 if you also want a switch, AP, and PoE injector at the destination. Compared to point-to-point at ~$400+, MoCA is roughly half the money and a tenth of the install effort — if you have the coax.

Where this fits