If you know who is interfering, then call them up and let them know! They may also be interfering with adjacent commercial frequencies. If there is no action call the FCC!
The statement above about being secondary users on the RC frequencies is like kit gloves hiding a fist and brass knuckles. Several years ago a TV station here went digital. We lost ALL of the RC flying frequencies above Ch 26 for a 50 mile radius around OKC. The fact was confirmed by two pattern flyers who go hit on the same channel at the same time on opposite sides of town. A letter to the FCC stating that we had serious concerns about pollution of the radio spectrum received a rude "tough, your RC frequencies have no protection at all" My point, the FCC wont help either. We finally found a TV tech at another station who confirmed the broad band problems and got his union mate at the first station to get it fixed.