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At present, in the U.K. there is the option of using licence exempt' domestic grade microwave tranmission (2.4GHz
The domestic units should ideally not be used in close proximity to a number of residential addresses; after all, you dont want to risk the possibility of other residents down the street watching your highly secret covert operation on their own internal TV system (the best way to check if other systems are working nearby is to simply view (without transmitting) the reception on each of the four receiver channels; if one is already in use, it will become obvious quite quickly.
There are of course other industrial grade transmission systems available using 2.4GHz, 1.34GHz, (and a number of other restricted frequencies only available to police & specified users) which are capable of exceptional quality over varying distances.
Another useful advantage of wireless transmission, is that in the event that a camera is discovered, it is quite obviously not possible to follow the cable back to the recording system.
So even if the camera is disabled, their should still be plenty of pictures remaining untouched on the recorder.
In some specialist situations, it may be worth considering transmission in a compressed data format such as M-JPEG, MPEG, Wavelet (or others) which can then easily be accomodated by a suitably set up, laptop computer.
Looking ahead slightly, the rapid developments in Mobile Phone (Cellphone) technology, mean that tranmission of covert camera images using a portable phone, or a Mobile / Laptop combination, will increase in popularity as the technology becomes better understood, and indeed more affordable.
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