It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
That looks to me like a VHF or UHF room transmitter. If it is then someone within about 150 – 200 metres has a matching receiver and either is or has in the past been listening in to the room where the device was found. We used to sell them for about £200.00 (That’s just for the transmitter that you found). The receiver would probably have been roughly the same price. The units are now strictly illegal because they operate on a banned frequency.