Have to be real close to vehicle for remote keyless entry to work

I need to be standing real close to my 2001 Montana in order for the doors to unlock or lock with the remote keyless entry. It seems like there should be some kind of adjustment for the sensitivity of it. Dealer says that it is functioning normally, but it worked much better previously. I changed batteries and got no improvement.

Anyone know what may be causing this? I saw a TSB titled 01-08-52-005 Remote Keyless entry not functioning properly. How can I see the full text of TSBs?

Thanks,
Mark

If you have a nice dealer, they will print them for you. As far as the transmitter distance, try looking at the keyless entry module, the antenna may have come unplugged. It is mounted in the center of the dash near the defroster outlets.