PCTEL Maxrad 132-174 MHz 2.4 dB Wide-Band Field-Tunable VHF Mobile Antenna 132-174 MHz 2.4 dB. Wideband Coil Antenna. Frequency: (MHz) 132-174 (Tunable). Product Narrative Wideband VHF antenna. Maintains desired resonant Frequency: through heavy shock vibrations.