Never had to pay for new batteries. The old ones were always still under warranty. I actually did install a quick disconnect on the battery. Car starts great in the morning when I remember to use it. Die Hards are still a Johnson Control battery? Did not know that. Oh well, at least I'm not supporting Wal-Mart any more. The power antenna could be the culpret. It has difficulty getting it up (I usually have to pry it up a little to get it started.) Couldn't I just pull the fuse for it instead?

I would check the alternater it could be over charging and burning the batterys up

Try extending the antennae and then pulling the power supply so it stays up and off all the time.

Just an update. I did pull the antennea up and disconnect the harness from it. No more battery problems. Silly how something so inoxious could cause so many headaches.