Spunk, I'm using the 5ghz band. Channel 149. Only one other network withing range on that channel.

Honestly though, why would the presence of other networks on that channel ONLY effect the...

Similar problem here with same wifi card. Just bot from Amazon. Love the machine, hate the wifi card.

I have ~10 other devices on the network which all work just fine...
4 iphones
2 notebooks...