Mica, my OpenBSD router, had spotty wireless performance, prompting me to use the TP-LINK WA901ND as a wireless access point.
This hasn’t been working as well as I’d hoped (or initially saw). Wireless performance was still spotty. As well, UPnP packets would not route through the wireless interface and hit miniupnpd on mica. I tried lots of things and nothing would work.
Inspired by the blog post Extending Your Wireless Network With Better Antennas, I bought two large 2.4 GHz antennas and replaced mica’s stock antennas. Signal strength went from ~65% to ~95%, and there was hassle free performance all night. UPnP even worked again because the multicast packets were not traversing subnets anymore.
Well, mostly hassle free. There were some instances of latency when watching Netflix, and a network test showed that the PS4 thought the connection was limited to 200 kbps down and 200 kbps up.
Still investigating.