This is portable amateur comet GP 3 antenna , also called 1/4″ Wave FM antenna for receiver and transimitter, composed with 4 pcs of Telescopic Antenna by 20-112CM long, to improve the RF gain and efficiceny , increase the transimitting distance and sensitivity as receiver greatly. It is flexible to adjust the length freely by 4 pcs of Telescopic Antennas from 20 cm to 112cm each. It is smarter than the fixed element length of antenna in the market.

By this antenna, you can t fix 1/4″ Wave Antenna precisely to Max. transimitting efficiency by the formula: Element Length(Meters)=(300/frequency)/4,
e.g. suppose you need the transimitting frequency is 100MHZ, and then you can adjust the Telescopic Antenna element length as (300/100)/4=0.75 meter.

Also, if you use this FM antenna on this SDR unit, the sensitivity will be improved greatly and better performance on frequency 68-350MHz.
Warrnning: Please make sure you pose the direcion correctly as follows as comet GP (Ground Plane) antenna:
Main element antenna is pull up vertically; And other 3 ground antenna is pull out by 45 degree.
Your transimitter will be distroyed if you have to make correct length and pose for this antenna.
Standard Sales Packing content:
1X comet GP antenna without coxial cable;
(Optional: 1X 50Ω
Coxial feeder wire connector, from SMA male to BNC male, need to place another order)
Coxial feeder wire connector, from SMA male to BNC male, need to place another order)




Try this Portable comet GP 3 antenna 1/4″ Wave FM antenna for receiver & transmitter with telescopic antenna 68-350MHz BNC connectors, it worth.
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