Typically and unmodified handheld CB will have a decent talk distance of 1-2 miles with both being a handheld. Further distances can be had if one of the radios was a mobile or base station with distances of more than five miles with weak signals. In some cases the antenna can be changed to a better longer antenna. Extention type antennas typically transmit about a mile per watt. Conditions such as terrain will have an impact on signal specifically mountains or buildings. Better results may also be had by purchasing a mobile magnet mount with a PL-259 to BNC to fit the radio. A magnet mount placed on a air conditioning unit or large cookiesheet as high as possible will make decent gains for distance if the radios are intended to be stationary.