So you want to help your vehicle get better aerodynamics by removing exterior options, but don't want to lose radio reception? Do a simple relocation of your original antenna then. My 1998 Metro radio antenna was broken off and I got tired of listening to the same old CD's all the time. A replacement antenna was cheap enough, but I am Hypermiling here and don't want an external radio mast sticking out of the body. I found a used antenna from an old car at a yard sale for $0.50 cents and decided to get some radio reception finally.
First thing was to remove the "A" pillar trim by pulling it off and sliding the antenna down the pillar. I plugged the antenna into the radio and put the trim piece back on. I decided to have mine stick out slightly to also use it for holding receipts, toll tickets, etc. You then need to find a rubber grommet or piece of plastic to cover the original antenna mounting hole.
Here are a couple pics.................
