Ok guys here is a new one or an old one if you know about it. A lot of businesses are concerned about wifi security so they have installed Anti Wifi protectors. This will effect wifi video signals as well. Not sure what that tower was but it could be supporting such a device. A lot of people in security call it a wifi jammer. There are hammers for GSM, 2G,3G,4G, cellphone LoJack, WIFI and GPS jammer built into one unit. They sell for around $350 and that's cheep protection for businesses. Some can run as high as $5 thousand dollars. Business have to protect against loss of data protect their secrets will use these devices. If we get to close then it jams our video or worse. Be careful flying around business that may have sensitive info. They probably support jammers. Hope this helps!