Is this mic considered "uhf or vhf?"

Since this system operates between 530.025 and 559.000 MHz, this would be considered a UHF microphone system (the UHF band covers radio frequencies from 300 to 3,000 MHz). VHF systems operate at lower frequencies, between 30-300 MHz. With any wireless system, you need to be mindful of other systems operating in the same range. I have not had a lot of trouble with interference.