I would like to install a hidden radio antenae on my Olds and weld up the existing hole on the front fender. Is there some sort of kit available for this?

 

In the most recent Speedway catalog they have a hidden antenna kit on page 148 for $42.99. If you use it do not hide it inside of a body panel, I think it is intended to be mounted at the upper edge of the windshield. If you put it inside a body panel most of it's effectiveness will be negated. Good luck.