Long range listening devices UHF

We are often looking for a powerful audio surveillance transmitter, which can transmit the audio wireless, to a long distance remote receiver. We also ask for extended privacy, so our transmissions won't be received by someone in the neighborhood.
The distance, audio clarity and the stability are the most important factors for any bugging undercover device. All our listening devices can offer most factors.
However, there are many cases where you need a much powerful listening device, for extended distance. The terrain has a huge influence on distance. For example using covert microphones at ground level, in crowded areas or nearby metallic objects (pipes, power-transformers or even cars) may not provide the best results. You need more power in these cases.
All the listening devices we offer you in this category are 6-8 times more powerful compared to the usual listening devices.