GEMEK 36ft SMA Male to SMA Female Pure Copper Cable, Low Loss S-MR400 Extension Coaxial – Antenna Lead Extender for 3G 4G 5G 6G LTE ADS-B Ham GPS WiFi RF Radio Use (50 Ohm Not for TV)
$39.93
Price: $39.93
(as of Nov 05, 2025 20:48:25 UTC – Details)
GEMEK Double shielded coaxial extension cable made of low loss S-LMR400 sized pure copper coax cable.
Specifications:
– Connector 1: SMA Male plug 50 ohm
– Connector 2: SMA Female plug 50 ohm
– Length: 36 feet(11 Meters)
– Impedance: 50 Ohm
– Coax: Double shielded Low-loss S-LMR400 size (10.3mm/0.4 inch diameter)
– Operating temperature : -20°C ~ +70°C.
– Minimum bending radius is only 2.44 inches.
– 90 degree bends in one inch or less without loss.
S-MR-400：
S-MR400 is an excellent cable for runs up to 50-70 feet in WiFi and Cellular use,
and provides superior performance for HF/VHF/UHF installation up to 250 feet.
S-MR400 Coax is the same size as RG-8U or RG-213 cable, 0.405 inches in diameter.
A larger cable means a much larger center conductor and supports better signal retention for higher frequency use.
S-MR400 assemblies are a drop-in replacement for RG-8/9913 Air-Dielectric type Cable and are ideal for Jumper Assemblies in Wireless Communications Systems,
Short Antenna Feeder runs, and any application requiring an easily routed, low loss RF cable.
Application:
Use to connect SMA radio sources such as modem, routers, WiFi Signal Booster Repeater, etc.
to the female SMA connector found on many external fixed mount antennas (e.g. fiberglass omni-directional, directional panel, sector), receivers, meters and radio transmitters.
NOTICE :
NOT for use with 75 Ohm TV video devices.
The is SMA Male to SMA Feamel Cable, Not RP-SMA Cable
Package List: 1 x SMA Male to SMA Female Low Loss Coaxial Cable (As the Picture Shown)
✔Connector: All-copper SMA Male to SMA Female adapter.(Note: Not RP-SMA Cable).
✔Connect from SMA Equipment to SMA Female Antennas, receivers, meters, radio transmitters and WiFi Signal Booster Repeater.
✔36 feet(11 Meters) Low-Loss S-LMR400 Size Coax, Impedance: 50 ohm. S-MR400 offers a significantly larger center conductor and supports better signal retention for longer cable runs and higher frequency use.
✔Double Shielded Coax extension cable assemblies are constructed with top quality extremely low-loss S-LMR400 cable and gold plated connectors. High frequency low loss and low impedance, heat Shrink on Both Ends.
✔Compatible with all SMA-based equipment including modems and routers & WiFi Signal Booster Repeater from Cisco, Digi, Cradlepoint, Proxicast, Pepwave, Sierra Wireless, Sixnet/Red Lion and many others.
Customers say
Customers find the coaxial cable to be of good quality and well-made, with positive feedback about its functionality. However, the cable size receives mixed reviews, with several customers noting that the connectors are too small. Moreover, customers report issues with fit, particularly with TV boxes, and describe the cable as stiff. The signal strength and compatibility aspects also receive mixed feedback.
13 reviews for GEMEK 36ft SMA Male to SMA Female Pure Copper Cable, Low Loss S-MR400 Extension Coaxial – Antenna Lead Extender for 3G 4G 5G 6G LTE ADS-B Ham GPS WiFi RF Radio Use (50 Ohm Not for TV)
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$39.93
HUY LE –
3ft SMA Male to SMA Female Pure Copper Cable
The pure copper core, in conjunction with the exterior sheathing that was extremely long-lasting, emanated a sense of quality and durability that fostered trust in its capacity to survive the rigors of daily use. My devices were able to establish a connection without any problems thanks to the SMA connectors, which had a secure and well-engineered feel to them. As someone who frequently works in locations that have inconsistent signal coverage, I am unable to stress the impact that this cable has had on both my general user experience and this cable’s ability to increase my productivity. By merely attaching it to my WiFi router or modem, I was able to experience an instantaneous and significant increase in signal strength. This completely eliminated those frustrating dead zones that had previously plagued my workspace.
G. McGrath –
Works for a flex radio 8600
Works for a flex radio 8600
Louis W –
Great customer service!
This is a pretty simple product but the first one I got had a bent end. Package wasn’t damaged or anything so I thought this might turn into a pain to get corrected. One quick email to Amazon and what do you know? A new one was sent and arrived in a few days, no questions asked. Sure it was a little inconvenience but it was resolved very quickly. Things will happen every now and then so it’s good to know Amazon will be there for you. By the way, product works very well. Thanks Amazon!
Michael Laferriere –
Good coax, low loss, great for amateur radio
As some reviewers have mentioned it is a fairly stiff coax. The center conductor of LMR is solid and thicker than most common coax cables. This is good electrically but not always the most convenient to work with. Its best for a fixed installation especially if you have a long distance between your transceiver and antenna.
Eric G. –
Seems nice but it’s probably not what you need – not for normal cable connections
I was looking for an extender for an HD antenna and was drawn into “antenna” in the item title. I now realize that there are different sizes – I should have real more comments and Q&As I guess, but it would help if the seller was a bit more clear in the description, as casual users who just want to get something ordered don’t have the knowledge / expertise / time to learn about cable widths and different uses. Sort of a shame, because it seems nice and there is a market for extenders (for normal cable outlets).
AzDayton –
NOT Standard TV Antenna Cable Size
So I have a TV antenna, and wanted to extend the reach to put it up higher. So when I saw “Antenna” on this, I figured it was the right size. IT IS NOT. The TV antenna cable uses the same coax size as the TV cable that comes out the wall. This is significantly smaller, and is probably designed for some other type of antenna. Fortunately, I have a friend who can use it, so it’s not a complete waste.
Amazon Customer –
Good quality cable.
I bought this to connect an antenna in my attic to my SDRplay RSPdx. It replaced an RG-59U cable with F connectors and adapters. It I saw a significant improvement with this cable over my cheap extension. The cable is stiffer than I expected and feels like a very good quality cable. IMHO it is definitely worth the money.
DLSims –
Connecters don’t fit standard antenna connections
Connectors of connecter axial cords were way too small to connect to the standard connecters on TV digital antenna. That was a disappointment, so was unable to get antenna where I wanted it.
PEGO –
No cumple lo anunciado(el conductor central no es de cobre).
julie Cooper –
Did the job
Richard –
Fonctionne très bien avec mes caméras de chasse pour connecter la lanterne lte.
Winfried Lange –
Dieses Teil brauchte ich für ein Raspi Projekt. Es ist sehr gut verarbeitet und funktioniert bestens.
Sabeer Ali –
good