I have a VHF radio sysem that works welI but I would like to update to Spread Spectrum. Our service area is in an L shape and uses two repeaters to reach around a protruding range of foothills. The protruding hill is a popular spot for commercial communicators like Syringa and other providers, etc so I have stayed out of that league. My longest link is 18.82 miles from the Base Station to one Repeater. I have tested the link and acheived connedtion between two 3 Db Onmi antennas but the connection is weak and I could not succesfully download a program to a logger. There is no ground interference between the two sites but some folage may be inbetween at the Base Station end which is downtown. Any advice would be appreciated.