Yes you can do this and when set up will work but it is another level of complication. If you really need to have specific clients connect to specific APs (antennas) will provide screenshots in morning when I get back in to work.
create ACL create 2 WLANs add MAC to ACL assign ACL to WLAN ===================== now:
create 2 WLAN groups add relevant APs (antennas) to relevant WLAN group assign relevant WLAN (ssid) to WLAN group
When you have done it it starts to make sense but initially seems overly configured. This is because the functionality has to scale for much more diverse, highly populated and complicated situations than just a few APs/clients
[With only a few devices it seems madness but when you have dozens or hundreds breaking APs and WLANs into groups gives you much greater control]
ZD gui, Configure, Access Points:
Create AP (antenna) groups
then add APs to that new group
and add them to WLAN groups
So now you can go back to the AP group and select which WLAN group it will use - greyed out box at bottom.
AP groups contain APs and use WLAN groups to know what WLANs they should broadcast. WLAN groups contain the individual WLANS and they use ACLs to allow clients by MAC. Simple, tee, hee. I need to rest.
Hard to get your head around but it all makes sense...eventually.