My understanding is most modern radars do not have a danger area like the 20 feet (?) limit on older systems. The October 1994 edition of the Collins WXR-700X Weather radar systems Pilots Guide on page 33 has a Note stating: The average radiated power density of the Collins WXR-700X is significantly less than the 10,W/cm2 allowable for limiting the exposure of rf energy to humans as noted in FAA Advisory Circular, number 20-68B, dated August 1980. The WXR-700X does not require the use of dummy load when operated on the ground.
I understand that means if there is a danger area it is about two centimetres in front of the dish? I recall that figure from a technical document a long time ago but don't know which one so treat with caution.