Neither are mine but my scanners running telescopic all band antennas do pick up CB transmissions now and then.Service type is "Other" for CB. I never hear anything on these channels, probably because my antenna isn't designed for 27mhz.
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If you mean monitoring from your vehicle you could get something like a K40 mag mount or something similar and an adapter to connect the co-ax to your scanner. Even a resonant antenna isn't going to be very good inside of a vehicle.I do have a center loaded telescopic that I’ll try. Going on vacation and it would be fun to listen.