It should be noted however that the RF power you utilize should be set accordingly for the distance between the mic and the receiver. The goal is to use the lowest amount of RF power possible for any given distance.
Along with coax, passive splitter and filter losses, and RF noise floor.
If you were within 50' of the receiver, you could have been cooking the antenna's.
Only if they are active antennas, which should almost never be used.
There is some math involved, but typically anything between 50' - 100' only needs about 10mw of RF power. After that, you can start cranking it up if you are noticing weak signals.
Again, one needs to also account for RF noise floor and losses due to coax, and inline passives.