Hello Alexandr,
I would assume that you are talking about the ML-2499-
HPA3 antenna and not ML-2499-
MPA3. Since the ports on the AP7522 AP are diplex, only diplex antennas are listed in the guide.
The ML-2499-
HPA3 can be used with this AP, but since it's 2.4GHz only, the 5GHz radio will not talk over this antenna. In other words you will lose the 5GHz radio if this antenna is used.
May I ask why you would like to use this versus a diplex antenna?
Christoph S.