Recently I purchased a MAX700 we are probably 20km from the nearest tower, so each usb has a single external directional Yagi antenna. I plugged in all the yagi’s this morning and got a speed test of: 37mbps down and 17mbps up, was very happy. Now an hour later I am getting 0.17mbps down and 22mbps up. With such a good up speed, it cant be the aerials, so I am wondering if I have not set up the router correctly. Any help would be greatly appreciated.