30 ft. Antenna extension coaxial cable RP-SMA Male to N-Female RFC-400 low loss


This special low-loss RP-SMA male to N-Female extension cable is RFC-400 (LMR-400 equivalent) shielded. The cable is 30 feet and can be used to put an extension between an RP-SMA antenna connector on a RAK 2, Nebra, or Bobcat miner on one end, and the RAK N-Male style outdoor antenna, or another N-male antenna (this has N-female, so connects to N-male antenna).

This cable is designed to use your miner with a RAK or Nebra brand N-male antenna and does NOT fit the Rokland 8 dBi miner antenna. If you have the Rokland 8 dBi, click here for cable choices

We recommend this extension cable compared to some others online because it is a special low-loss cable (RFC-400 Low Loss 50 OHM). What does this mean? The antenna to which you will connect this to has a gain. Let's say for example you will be connecting this to an 8 dBi gain antenna. As the cable in between the antenna and adapter gets longer, you will experience cable loss, which is a drop in the signal gain of the antenna. With low-quality unshielded extension cables, the huge drop in gain will mean a much lesser range. Our special low loss cable limits the cable loss factor and preserves the high gain of your antenna.

Made in USA. This cable is American made and manufactured for superior performance and quality control.

We do recommend RokTape to seal all outdoor connection points. 

Compare gain loss of this cable:

915 MHz application: -1.1 dB (Helium mining/LoRa device)

WiFi 2.4 GHz application: -1.9 dB (standard home WiFi networking)
WiFi 5 GHz application: -2.9 dB (dual-band 2.4/5 GHz WiFi to 5 GHz networks)

Compare this to a cheaper RG-58 shielded cable of the same length- the gain-loss would be -4.5 dB for 915 MHz, -8.7 dB for 2.4 GHz WiFi, and a whopping -14.9 dB for 5 GHz WiFi

That means standard RG-58 cables have over 4x times as much gain loss as this cable!

If you invested a lot in your antenna, it is worth the extra amount to get a 400 grade low loss cable to maximize your antenna performance. This goes double for Helium mining- a higher loss cable means you may be getting less reach with your miner, and therefore mining much less.

Additional Features:

- Length: 30 feet
- Impedance: 50 OHM
- Frequency: all bands from 0-6 GHz, including 868-915 MHz LoRa, 2400-2700 MHz WiFi/ 5100-5900 MHz WiFi

- Compatible with 2.4 GHz 802.11ac, 802.11n, 802.11g and 802.11b WiFi standards, 915 MHz LoRa standard
- Compatible with many WiFi adapters & Helium miners with RP-SMA ports


1. I see 9m cables on eBay for only a few dollars with free shipping from China. How can you charge so much for just about the same length?

An antenna extension cable is not like a power extension cable you would use with an electric lawnmower. In other words, all antenna cables are not basically the same. When you use a cable in between the antenna and the WiFi adapter, the gain of the antenna decreases markedly. This is a factor known as cable loss. The $3 and $4 RP-SMA extension cables in abundance on eBay have no low loss shielding. Using them will cause significant gain loss- so much so you may find your factory antenna connected directly to your adapter will begin to work better than your expensive high gain outdoor antenna. To limit gain loss, you need a thick shielded low loss cable, from a trusted manufacturer like ALFA Networks. It has special low loss shielding to limit your gain loss and simply works much better than cheap cables that have no low loss shielding.

2. I already have (or want to buy) an external antenna for my wireless adapter, and I want an extension cable so I can put my antenna further away from the adapter. How do I know if this is the right extension cable for me?

Check with the maker or seller of your antenna to find out what type of connector it has. As a rule of thumb, you want to get an RP-SMA male to RP-SMA female extension cable when the antenna you have can connect directly to the RP-SMA connector on your wireless adapter if you wanted it to. That would mean your antenna also has an RP-SMA connector, and this would be the right cable for you. If your antenna has another type of connector, meaning it is not possible for you to connect it directly to the RP-SMA connector on your wireless adapter, then please contact us so we can help you locate the right cable for your needs. Additionally, we always recommend getting as close to the length you need as possible. If you are only trying to go 10 feet, don't buy a 30-foot cable as you will have more gain loss.

Warranty & Support:
Complimentary Telephone and Email/Live Chat Support (Click Here)

State sales tax of 7.5% will be added to FLORIDA purchases only. There is no sales tax for any other state.

Return Policy: This item is a final sale item. Final sale items may not be returned except in cases of defect. Expedited shipping charges paid are non-refundable. 

Customer Reviews

Based on 27 reviews
Jose Jimenez
Good quality cable

This review is for a 30’ LMR 400 cable. The cable is very well made and was shipped fast. Rockland is a great company to do business with.

Carl Graham

Good service good product

Jeffrey Addison
Always high quality items

I use Rokland exclusively for my Helium needs. Great customer service, fast shipping and high quality items.
Thank you!

Jorge Chavez

30 ft. Antenna extension coaxial cable RP-SMA Male to N-Female RFC-400 low loss

Martin Bouda
Good cable but connector broke off

Cable is good but not sure about the connector (RP-SMA) quality/strength as it broke off. Crimped on my own after spending almost as much as the cable cost on tool and connectors.