20 ft. Antenna extension cable N-Male to N-Female RFC-400 Ultra Low Loss Coax Cable


Pickup available at 2251 NW 41st Street

Usually ready in 1 hour

Low-loss N-male to N-Female extension cable, RFC-400 shielded. The cable is 20 feet long and is designed specifically to go between a Nebra Outdoor/Milesight miner and both our Rokland 5.8 dBi outdoor 915 MHz miner antenna and our Rokland 10 dBi outdoor 915 MHz miner antenna. If you have a miner other than the Nebra Outdoor or Milesight, this will not have the correct connector to go directly between our 5.8 or 10 dBi antenna and your miner.

The antenna to which you will connect this to has a gain. Let's say you will be connecting this to a 5.8 dBi gain antenna. As the cable in between the antenna and device gets longer, you will experience gain loss. With lesser grade shielded extension cables, the huge drop in gain will mean much worse performance. 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: -0.8 dB (Helium mining/LoRa device)
WiFi 2.4 GHz application: -1.3 dB (standard home WiFi networking)
WiFi 5 GHz application: -2.0 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 -2.8 dB for 915 MHz, -5.2 dB for 2.4 GHz WiFi, and a whopping -8.6 dB for 5 GHz WiFi

That means standard RG-58 cables have much more gain loss than this cable!

If you invested a lot in your antenna, it is worth the extra amount to get a 400 or better 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.

Why does this cable cost more than other options I see online of the same length?

Cables with a lower grade shielding will cost less because they consume less raw materials and are cheaper to make. This cable is also three times heavier than a CFD-200 grade cable for example, so the shipping cost is higher too- both on import, and for shipment to the end user.

Additional Features:

- Length: 20 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
- N-male connector to N-Female connector 

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

Return Policy: Coaxial cable may be returned for refund if new within 30 days of delivery. Used coaxial cable cannot be returned except in case of defect. We only cover return shipping in case of wrong item shipped. Returned orders with free shipping selected will incur a 15% recovery fee to help us recover some of the original shipping cost, unless the item is defective or incorrect. Expedited shipping charges paid are non-refundable. For bulk purchases, see our bulk purchase return policy here.

Sales tax is required in many states and will be added at checkout if applicable to your delivery state. Tax exempt forms can be sent to our support department.

Shipping & Returns
FREE Standard shipping on all items shipped in the USA! 
We are in Florida and ship to: USA, Australia, Austria, Canada, France, Germany, Israel, Netherlands, and the United Kingdom. Local pickup available in Gainesville, FL

Expedited shipping orders placed before 3PM EST weekdays will ship that day. Standard shipping orders ship within 1 business day.

Sales tax: shipments shipped to states in which we are registered to collect tax will have appropriate tax added at checkout. Tax exempt forms can be sent to our support staff who can activate exemption status. 

Lost packages and insurance

International Shipping:

Shipping options are visible in cart by using the shipping estimator. Transit times posted are estimates. International packages are subject to customs holds and duty payment may be required by your government on delivery. The cost of duty  is not reimbursable. Internatonal shipping charges are not refundable in the event of a return.


See item description for product specific return policies, and return policies vary by item.

Bulk/High Value Order Returns

Due to the labor required to package and ship bulk orders, as well as cost and stock issues involved in replenishing items, bulk orders of 5 pieces or more are not returnable unless the equipment is defective or mis-advertised, or a return period is prenegotiated. For non-defective returns over $500, a restocking fee may be deducted from the refund to cover bank or card processing fees.


Items on backorder or preorder will ship as estimated on the item page. You can cancel an order any time up until shipment. Orders with expedited shipping will arrive in the advertised time after the order ships, not after the order is placed.


If you want to cancel an order, please email or call us at (352) 372-9902. If your item has not been shipped, we will cancel the order and provide a full refund.

Customer Reviews

Based on 3 reviews
Works great!

Install was easy, and it works great. No complaints at all.

John Arnold
Cable Mania

Recently I purchased 3 - 20' LMR400 cables for my Nebra Outdoor Helium Miners. After extensive research I picked Rokland because of their reviews and the helpfulness and straight forwardness of their online customer support (thanks Sam). They arrived within the week just as they promised. Arrived in a simple box with adequate packing. Looked and felt just as I expected solid, heavy well-made cable with great connections. I've installed one so far, and compared to the original cable that came with my other miner the superiority of the Rokland cable is clear...less dbi loss resulting in higher rewards equals a quicker ROI. As far as I am concerned, all my miner will have Rokland cables.

Robert Raymond
excellent coax cable

excellent coax cable, less than 1 dB loss