Over the summer I did my Road To 100mph video series on Youtube and was having range problems with one of my sr3100 recievers and I found a tiny little cut in the antenna wire (a pinch mark from a reciever box top) bought a new $6 antenna and now the car will go further than my eyes can see and still be able to turn around and come back. This same reciever worked fine at a small track but if you start pushing the range you will definitely notice a difference.