If it is 27 Mhz you will want to do an antenna mod. Radio shack has longer antennas for cordless phone that you can buy. It isn't a very hard mod & it will help with your range. I doubled mine after doing it. You can also get Cad 5 wire & replace the antenna on your car. I did this with a 57 mhz lxx the other day & got great results.
I am sorry I don't have the number I think it was this one but i am not positive. I took my antenna out of my controller & brought it with me, made sure it was about the same width & was at least twice as long. I had to cut the circle at the bottom of the antenna alittle with my dremel so it would fit in where my original did & BLAM!!! better reception.
Are there any cripple caps on the controller or car? I have a LOT of cat 5 antenna. Black too. It's weird having 6 feet of range when my MS has about 50.