I am having a hard time finding professional antenna installers in Southern California (LA, Orange County) that will install and test 900 MHz antennas. W have this communications system that uses 1 watt 900 MHz tranceivers whithin a 1 mile range. There is a central location with a central omni-directional antenna and then the other locations use either yagis or patch antennas that point to the central location. We get the antennas off-the-shelf but need professional installers that will do filed strenght test, etc. I would appreciate any suggesions or referrals.