kevsh wrote looking at the archer d20 now and see it has two antennas. Those antennas thread off counter clockwise, and thread on clockwise. I forgot to mention that the router is a dualband .24ghz...

Model : Hardware Version : Not Clear Firmware Version : ISP : i've just bought a router Archer D20 but the signal is too low to reach the upfloor of my house so i purchased an antenna TL-ANT2405C but...