Use this base station antenna mounting kit to turn your mobile Antenna into a Base Antenna. Ground Plane Kit, put any VHF – UHF NMO Style Antenna on this Mount and you have a Base Antenna.
PCTEL – 136-512 MHz Base Station Adapter Kit
PCTEL MBS base station adapter kit. The MBS adapter allows a mobile VHF or UHF antenna to be used as a base station. By providing radials, the antenna can be used in areas where a ground plane is not available. Will accept any antenna that utilizes 1-1/8 inch 18 thread mounts. Mounts on 1 to 1.75 inch outside diameter masts. Converts any 136 – 512 MHz NMO mobile antenna into a VHF base station antenna.