Has anyone shortened an antenna?

Well I have an antenna that won't stay on the fender of my 66 B-Cuda. So.................I have to remove the fenders to install the inner splash shields( don't ask, but the car came without them), anyway I am going to install a power antenna, so I can then put a cover on it with out the antenna in the way, and no hole in the cover.
maybe 69cudaownr could use a power antenna also.
barracudadave67