need expert help - ping tests between two CPEs bad

Hello,
I need help. I have a basestation with an omni. i have several CPEs connected to it. their signal rate is between -55 and -65 for the furthest. when i do a ping test from basestation to the wlan of one cpe, i get over 3000ms speed. what is the problem? i am using 2.4ghz frequency.

Try one of these:

Change channel
Change to 2.4b only
Change to 2.4g only

If that doesn’t help you will have to post hardware and config.