I shaved the antenna hole on my 66 and am curious if anyone knows of a good quality antenna i can mount in the window or anywhere else.

 

I can't speak about the quality, but I've seen plenty of hidden antennas for sale just about anywhere (even Advanced and Pep Boys carry them). It's just a box you can mount under anything you want. My dad gotan Autoloc(flush mounted) antenna on his Porsche and hasn't complained about it.

http://www.thehoffmangroup.com/Autoloc/products.lasso

best I can do to help

 

I went with one of these. I have not installed it yet since the car is still at the body shop.
http://www.ecshylites.com/page/page/761353.htm