I have a ATEN 5G HD video sender

It uses Channels 1-7 automatically but I cannot find any details as to what 5G channels that actually relates to.

I previously had cable 50/2 and had no issues with interference (that I know of).

I recently got FibreX 200 and found that with the default router setting (channel auto) I get picture interference and with wifi drops out altogether.

I played around with the 5G channel setting on the supplied router and 116 seems to be the best I have found so far.  When the video sender is on it cuts the wifi rate in half but it is available and usable.

Is there a better way to set this up?