TP-link Router Model HC220-G5 AC1200 

Due to slow speeds wanting to check what channel my Mac Air is on, logged in to the MTH Networks (OFNL) http://tplinkwifi.net/ Router page as Admin, but not very clear, until I stumled over the Advanced Wireless Settings (hidden away)

How do I switch between the 2.4gh and 5gz ranges easily?

Unfortunately all I can tell is I am currently on the 5GZ range on Channel 40, but unable to see what channels my neighborus are on.

Also if anyone knows of a good free wifi scanner for Mac, please shout up.

Cheers