This is a 3/4 wavelength J-pole optimized using JSC 1220 custom twin lead cable. This antenna has been fully tested to 150 MPH winds using Lowe's 23990 3/4 inch 200PSI/SDR21 pvc pipe. The pipe is UV protected and should last easily 10 years on a repeater mountain top.

Specifications:
Overall Length: 4 feet, 50 ohm feed impedance, no ground radials. Antenna feed point is 10 inches above the connector. Conduit U clamps, hose clamps, etc. can be used for mounting up to the first 10 inches of the antenna without affecting performance. Antenna offers “true” ½ wavelength radiator at 223.5 MHz (centered tuned). Connector available in SO-239, please contact Ed Fong directly to order N-Connector version..

VHF (222-225 MHz)
Configuration: 3/4 wave length
Maximum power: 75 watts
SWR: less than 1.3 to 1 over a 3 MHz bandwidth and less than 1.5 :1 over 4 MHz bandwidth.
Matching system: 1/4 wave matching stub
Gain: 2.1 dBi
Impedance: 50 ohms