Low Band interference with 5.7 GHz Canopy Unit

Anyone ever experience interfernece from a low band transmitter? We have a 60 Mbps 5.7 GHz Canopy link at 17.5 miles with a signal strength of -59 dBM. However, everytime the low band base is keyed up, it cuts out the Canopy link. We have shielded CAT5 cable, and the Canopy antenna is properly grounded.

Any thoughts or ideas would be appreciated.