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Depends on the antenna you buy. Decide on the antenna then choose the mount. Most CB antennas use a 3/8 thread but the Sirios are a SO239 connection.


Also go to this website: www.k0bg.com and read up on mounting, grounding and especially bonding. Yes its aimed at amateur radio but radio is radio and everything there is applicable to CB especially if you're going to run a linear. Take the time to do the bonding on your vehicle as that website says.