I bought a tire change kit, it comes with a nice built in antenna, waterproof booster etc. looks cheap but works. I think the tire shop ads are a bit fake, they say the booster is for LHVs only, but that's bullshit. I was using a pickup with a short trailer and kept losing the signal. In my opinion you need a booster for every tractor, so that's what the tire changer should say. I also need to be able to put an amplifier on the back of the tow vehicle next to the hitch and get a signal. TM says