I cannot find a choke that will filter out 118.775 VHF.
Anyone have a suggestion on a choke since it will be the cheapest place to start?
It is difficult to give useful suggestions without knowing what EMI precautions have been tried and been insufficient.
Presumably you don't want to filter out only 118.775MHz, but want to prevent all RF entering your system. In that case have you tried wrapping the input leads (certainly audio, but possibly power) through a ferrite toroid, or even clipping a ferrite toroid around them. Quick, dirty, cheap, sometimes effective.
You could always ask your local radio hams; they will have dealt with this kind of thing many times before.