Posted By Seamus O Sullivan Hello On some roof tops, there can be many antenna, from various operators. Some operators require other operator's antenna to be shut down before their employees work near the antenna. This usually applies where the guys work there for a long length of time. Confirmation of shutdown is of course required because this shut down is done remotely and by prior notice given to the operator in question.Usually there are three antenna in a mobile phone operators cell, and they can just switch off one if required, but will they switch off the right one? All operators should have labels on their equipment to distinguish one antenna from another. I would be concerned of the effect the non ionisation radiation could have on a person with a pace maker who might be working on the roof. There are meters available that measure workers exposure to the radiation. By the way out of intrest I have used a microwave oven leakage tester on the roof of a few places and it lit up fully and gave a full deflection on the meter, but only about 1 meter from the antenna. A microwave oven that gives such a reading has to be put out of use immediately. Under the code of practice that the operators are suppose to follow, I understand the area around the antenna is suposed to be fenced off and have warning signs etc. The operators may state the equipment is safe and I have no doubt that it is, but they are referring to the public who are far away from the antenna. Your concerns are with the workers on the roof. This also ties up nicely with the potential liability of the property owner. Hope this is some use Seamus

Posted By John Murgatroyd Anybody who stands in front of a microwave "dish" or an open waveguide can expect to receive MANY times more radiation than standing at the side, or further away. Radiation detectors for "microwave ovens" are notoriously inaccurate, being little more than a few diodes, a capacitor and a meter (of sorts). I would expect even an ordinary multi-range test meter to give max readings on any ac range when stuck in front of the "dish" antenna....even if only because the gain of said antenna would be in the order of 30 db...so your 50mW would end up as 50 watts...I certainly wouldn't stand in front of it....I like my eyes !