I have version running on a GS model, and it displays properly on a browser connected to the LAN port. I'm running NetSurveyor on a nearby laptop to measure beacon strength. With the stock antenna, this averages 800 mW. I hooked up an ARC flat-panel antenna (marked 2.3-2.5 GHz and 16 dB gain), using 12 feet of Belkin RG8-X and appropriate adapter. The beacon then drops to average <5 mW. Rx and Tx are set to diversity, and it is the same when the antenna is connected to either side of the router.

The co-ax is neither shorted nor open, and the antenna elements appear fine (copper pads under a plastic cover). I figure that I might lose 4 dB in the feedline at most. So why is the beacon signal so low with this antenna attached? My radio experience is mostly HF and VHF, so any help is appreciated.