Hey.
It's been awhile since I posted.
There was a post on this before. It might depend on the stereo you have. The 2 Kenwoods I've had both worked with the power antenna. I'm not sure, but would assume, that other decks should work the same. It should only be the power antenna wire on the deck to the power antenna wire for the car. That should be all you have to do. Check the manials for each deck to see if they work in that fashion.
If not, do the remote switch.