Reliable Mobile Antenna VHF, Broadband Frequency Range 136-174 MHz, 26 MHz, 200 W

-Frequency Range: 148-174 MHz.
-Gain: 3 dB.
-Power: 200 W.
-Bandwidth: 38 MHz .
-Max Length: 53.94" 
-Requires 3/4" NMO58UNC mount.

Does not require adjustment.