UHF is the abbreviation of Ultra High Frequency. Usually, the UHF band that we use is between 400MHz to 500MHz.
We manufacture 3 types UHF receivers, and they are different.
The first two receivers are adjusted to one channel, and each one can be used with just one listening device. Usually, they workd within the range of 433MHz and 418MHz.
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https://www.petrutech.com/UHF-QUARTZ-STABILIZED/UHF-Receiver-stabiliized-by-quartz-PLL-418-or-433-MHZ
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https://www.petrutech.com/UHF-QUARTZ-STABILIZED/Receiver-UHF-stabilized-sensitive-detachable-antenna-433MHz
The third one is a programmable transceiver, modified especially for our bugging devices. It has 16 channels, and you may use several transmitters on different frequencies together, and they will not interfere: