Is it necessary to "profile" and adjust settings for each venue - assuming local radio/tv interference intensity will likely vary ?
I always start with a scan of the venue environment, both outside and inside. The FCC database is not always up to date but if it lists a DTV channel which you cant see its always better to assume it might come on at any time. Inside scans are useful since often the building shields you from TV stations and that channel can be used since it cannot be received in your location.
In IAS the scan can be imported in a graph which shows your frequencies. This scan I did with the TTI PSA2702
Spectrum analyzer whic is a mid range cost analyzer, about $2000. The Yellow channels are marked as DTV. The blue lines are my frequencies.
Here are 2 scans I took this week in midtown NY. The first is outsice the venue and the second is inside. Regardless of the shielding, I do not use the clearer DTV channels unless I have a particularly heavy coordination.
Please visit my webpage on RF coordination. Best Audio Frequency Coordination
. The RF Coordination for Roadies manual might answer a lot of your questions