what im planning on doing to mine is shaving the antenna off the side pillar completely so theres nothing there, then from the inside im gonna re-root the wires through to the headliner and have some wire coming out behind the rear-view mirror, then i believe you can buy in car antennas from car audio/electronic stores. and just simply wire it to that and stick it to the inside of my windshield.
I know some people have done that so thats an option.
in my opinion it looks a lot cleaner too
good luck man