Ruth's sister 144/430 MHz 36 cm internal power cable

Dual-band antenna for two-way radios

This antenna operates on 144/430 MHz frequencies and fits a wide range of handheld transceivers including VX, FT, UV, PX, KG, TH, MD and LT models. It replaces a damaged or lost original antenna to restore transmit and receive capability. The 36 cm metal whip provides a 2.15 dB gain with a 50 ohm impedance match. It is a direct screw-on part for the listed compatible radios.

Easy installation with SMA connector

The antenna threads onto the radio’s SMA jack in seconds without tools or soldering. A common issue is cross-threading the fine threads if forced at an angle; start it by hand until it seats freely. Another problem occurs when users mistake the RP-SMA variant found on some newer handsets — this antenna will not mate with reverse-polarity connectors. Verify the radio’s jack type before ordering to avoid a mismatch.

Practical limits of 144/430 MHz operation

The dual-band design covers the 2 metre and 70 centimetre amateur bands but offers no gain outside those ranges. At 36 cm the whip is a quarter-wave on 2 metres and a half-wave on 70 centimetres, so radiation pattern and efficiency drop on other frequencies. The fixed 50 ohm feed point cannot be tuned, so SWR will rise if used with radios that expect a different impedance. Users needing multi-band coverage beyond these two bands require a different antenna solution.