Bird Technologies AT-500-Manual - Manual (Page 36)

Bird AT-500 Antenna Tester
18
Special consideration must be given to the RF energy
present at the feed line of site antennas. At active
sites, RF energy from transmitters can be coupled to
the antenna under test. If large enough, these signals
will cause inaccurate measurements. For best results,
the AT-500 should be used with all transmit antennas
powered down.