Used for video transmission between choirmaster and organist at concerts in churches to simplify the often makeshift facilities in a hurry! Good transmission quality if properly placed. The transmitter and receiver are always in direct view, but sometimes distant 40m. The gates and other wrought iron railings are insurmountable obstacles by waves (Faraday cage) into account. Their constitution seems fragile and requires handling precautions is the reason for the star less.
