I agree with Kris.

Spend the money and get good quality aerials and spare/s. If you buy long aerials on springs, be careful that they won't end up through the windscreen and poking somebody's eye out.

Everytime I wash my truck, I always go around and make sure the aerial base is screwed in firm and not left lose. It doesn't take much time at all and should be part of your weekly maintenance.

Rossco