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Proxicast Low-Loss Coax Extension Cable (50 Ohm) - SMA Male to SMA Female - Antenna Lead Extender for 5G/4G/LTE/Ham/ADS-B/GPS/RF Radio Use (Not for TV or WiFi)

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Length10 ft (CFD 195)
Key Features

  • HIGH PERFORMANCE COAXIAL EXTENSION CABLE for 5G & 4G/LTE Cellular Broadband, ADS-B and GPS Applications

  • SMA MALE TO SMA FEMALE COAXIAL JUMPER CABLEConnects from SMA equipment (e.g. modem, router, booster) to SMA-style antennas

  • 50-OHM LOW-LOSS COAX with Heat Shrink Tubing on Both Connectors

  • GOLD PLATED CONNECTOR PINS on Solid Copper Core for Maximum Conductivity - Significantly Outperforms "RG" Series Coax

  • RATED FOR ALL CLIMATES AND CONDITIONS - Can Withstand the Rigors of Outside Use (not for plenum or direct burial applications)

  • *NOT* for use with Wi-Fi (RP-SMA) or video (cable/satellite/TV) devices


This premium low-loss coax cable is used to connect SMA radio sources such as modems, routers, etc. to the male SMA connector found on many external antennas or to extend the length of an existing SMA coax cable.

Compatible devices include 4G/LTE modems, routers, hotspots, boosters, GPS receivers, HAM radios, and ADS-B receivers. Compatible brands include Cisco, Cradlepoint, Digi, FlightAware, MoFi, Pepwave, Proxicast and Sierra Wireless.

SMA Coax Extension Cable


Low Signal Loss  Copper Core and Gold Plated Pins  Pro Grade Quality  Indoor Outdoor Use
Ultra-low-loss 50 Ohm coax cable for maximum RF reception and transmission at common wireless frequencies. Significantly outperforms “RG” coax cables. Solid copper core and gold-plated signal pins provide top-quality, high-performance conductivity. Commercial-grade components ensure maximum toughness and durability. Cable is assembled, inspected and 100% tested by in our ISO-9001 certified facility. Polyethylene jacket withstands abrasions and provides excellent moisture resistance for outdoor use (not rated for direct burial or plenum applications).


Proxicast recommends 0.195 inch diameter coax for assemblies up to 10 ft, 0.240 inch diameter up to 25 ft and 0.400 inch diameter up to 75 ft. It is acceptable to use a thick cable for the long portion of a cable run and a short thin cable to connect to equipment or antennas, but minimize the total cable length and number of connectors. Cable runs longer than 50 ft will generally require an in-line amplifier.

To ensure that you are selecting the correct cable, please refer to the Support tab for information regarding RF Connectors and Signal Attenuation.

Note: All outdoor coax connections must be weather-proofed to minimize damage caused by moisture in the connectors or cabling.  Use our Self-Bonding silicone tape (ANT-900-002) for fast and easy connection sealing.


  • Connector 1: SMA Male
  • Connector 2: SMA Female
  • Coax: Low-loss CFD Coax (LMR equivalent)
  • Impedance: 50 Ohm
  • Op Temp: -40 to +185F
  • Min Bend Radius: 2.0"


Pro Tips

For Best Results

  • Use the shortest possible cable
  • Do not cut or splice the cable
  • Observe the minimum bend radius of the cable at all times
  • Minimize the number of connectors used
  • Fully tighten coax connectors
  • Weatherseal all outdoor connections with silicone tape (ANT-900-002)
RF Connectors

SMA Female jacks are commonly used on 3G/4G/LTE cellular modems, routers and signal amplifiers - check with your equipment manufacturer.

Many indoor cellular antennas have SMA Male connectors; most outdoor antennas have either N-Male or N-Female connectors.

RP-SMA (Reverse Polarity) connectors are commonly used for Wi-Fi signals. SMA and RP-SMA connectors will not mate. 

Video equipment (cable, satellite, TV, etc) uses "F" connectors - which look similar to SMA but they will not mate with SMA connectors. Also, most video systems require 75 ohm coax cable rather than the 50 ohm cable used for RF.

See the photo gallery for pictures of the exact connectors on this coax extension cable and note the gender of the connectors you need to ensure male-to-female mating.


Coaxial Cable Assembly Loss

Attenuation or loss is a key specification for all coax cables. The function of a coax cable is to transfer radio frequency power from one point to another, however, some power is lost along the length of the RF cable and through the connectors due to noise, cable imperfections, resistance and other factors. The power loss caused by a coax cable is referred to as attenuation and is defined in terms of decibels per foot at a given frequency. 

The key elements which affect cable signal loss are:

  • length of the cable
  • shielding (diameter) of the cable
  • number of connectors
  • quality of the cable assembly components 


For short distances (10 feet or less), the signal attenuation at 4G/LTE frequencies is negligible for most applications, so 0.100 or 0.195 inch diameter coax is appropriate.  At longer distances, thicker coax cables are required to minimize signal loss.  To prevent excessive signal loss, shorter cables should NOT be linked together to make a longer cable.  It is best to use a single cable whenever possible.  It is also acceptable to use a thick cable for the long portion of a cable run and a short thin cable to connect to equipment or antennas, but always try to minimize the total cable length and number of connectors. 

Proxicast's coax extension cable assemblies are constructed with top quality extremely low-loss cable and gold plated connectors.  Each cable assembly is fully tested when manufactured.  Proxicast recommends CFD195 coax for assemblies up to 10 ft, CFD240 for lengths up to 25 ft and CFD400 for lengths up to 75 ft. Coax runs over 50 ft typically require in-line amplification.


Total Cable Assembly Signal Loss in dB Including 2 Connectors (lower is better)

  10 Feet 15 Feet 25 Feet 36 Feet 50 Feet 75 Feet
Frequency CFD195 CFD240 CFD240 CFD400 CFD400 CFD400
700 MHz 1.1 1.1 1.9 1.4 1.9 2.9
900 Mhz 1.3 1.3 2.1 1.6 2.2 3.3
1700 Mhz 1.8 1.8 3.0 2.3 3.1 4.6
1900 MHz 1.9 1.9 3.2 2.4 3.3 4.9
2400 MHz 2.1 2.2 3.6 2.7 3.7 5.6
2700 Mhz 2.3 2.3 3.8 2.9 4.0 5.9
5000 MHz 3.2 3.2 5.3 4.1 5.6 8.3
5800 MHz 3.4 3.5 5.7 4.4 6.1 9.1