2.4 GHz is indeed congested. There's nine 20 MHz channels in the 5 GHz band in USA. An additional 16 are available if client devices support DFS channels. Even

2.4 GHz is indeed congested. There's nine 20 MHz channels in the 5 GHz band in USA. An additional 16 are available if client devices support DFS channels. Even if there's weather radar and you lose channels 120-128, that's 22 channels.