Does it work on all CB channels?

Yes. Its 26.5–30 MHz range covers the 40-channel CB band, and it also tunes near the 10-meter ham band. Check SWR after install and trim the whip only if needed.

Do I need to drill a hole for it?

The NMO mount needs a hole or an existing NMO base. You can use an NMO-to-3/8-inch adapter or a lip mount instead, but there is no magnetic base in the box.

How tall is it and will it fit my garage?

The whip is 49 inches above the mount, so measure your clearance before installing on a roof. A folding adapter or quick-disconnect helps for low garages.

Is it better than a magnetic CB antenna?

It is more permanent and usually gives a better ground plane and range than a magnetic whip. A magnetic antenna is easier to move between vehicles but less stable at speed.

The antenna and its NMO base connection. The mount, coax and any adapter are separate, so confirm your mount type before ordering.

Does it need a ground plane?

Yes. NMO antennas rely on a metal surface under the mount for a proper ground plane. Mount it on a metal roof or use a ground-plane kit on non-metal surfaces.