I just purchased a vehicle with a Viper 160xv remote starter already installed..the starter will work fine up to a distance of 100 feet or so, but not beyond. I know this particular starter is rated for a distance of 1/4 mile. I replaced batteries in BOTH remotes, and the range is exactly the same. Any simple fix here? My next step (IN MY MIND) is to replace the antenna? Any help or suggestions would be appreciated!