Not happening with mine, and I'm using a stubby antenna. The only time I'm getting signal loss is when I go into a parking garage, long freeway underpass, etc. The signal for satellite is different than radio, which is why it needs line of sight from the transmitter on the satellite to your truck, versus the radio signal that is "pervasive." There is a buffer built into the receiver that holds, I think, about 15 seconds worth of data so you shouldn't have signal loss going under overpasses, bridges, etc. Also, remember the satellite is in a geosynchronous orbit, which means your antenna is looking south towards the equator for that bird way up there. If hills, tall trees are causing a drop out, there might (I say might, because I am not an electronics wizard) be a problem in your unit. I'd recommend taking it back to the dealer and have one of their techs who is electronics-smart go with you to where things are cutting out. I've always found it much easier to get things done when you can demonstrate failure versus having to just explain it...