Only the fixed Antennae?
How much of a problem is the signal from a mobile phone (or many mobile phones)? Is this a signal strength issue?
You can control where the fixed antennae are but not where mobiles are used. And they are certainly not angled downward.
Doesn’t a mobile send out a “squitter” from time to time to test network availability? On all possible bands?
And are there other items on these bands - stage wireless or sports equipment?