@jra11500 Unfortunately, with most stations using 80MHz, and even some stations using160MHz bandwidth, channel 48 is the same as channel 36. There are no free channels that aren't DFS, but than you...

My neighbour has his router/access point right next to the party wall, set to channel 36 with a bandwidth of 80MHz, so it covers all of the non DFS channels. The signal is very strong, much stronger...