Couldn't get reading on all tires, antenna not long enough, so Valor was kind enought to send me an extension. Installed extension, mounted antenna on bottom of receiver hitch, and all was working fine for about 2 hours, with all tires (both axles) showing pressure and temp. Stopped for fuel and when I started the truck and turned the monitor back on, all zeros for pressure and temp. Has been that way since (700 mile trip over a week's time. Tried moving antenna around, but still showing all zeros no matter how long I leave it on. Even with the short antenna I was getting readings from the front axle sometimes, but now nothing. Book says all zeros could be a sign of a bad monitor....I've only used the unit twice, the first time with the short antenna (unreliable reception), and again after installing the longer one. Unit came with Landmark Savahna which I purchased new in April, from RVs for Less in Knoxville.