at 300 the feet the connection may still work, it wont be a good connection if it works at all. The best solution is to indeed have repeater like previously stated. haveing one repeater would work, I have run cables over 100 feet and they work fine, I just dont recomend doing it. Another option would be to switch to another type of cable such as coaxil, this has a laonger range, but does cost more. well gl.