We have an AP-175P running outdoors with a pair of ANT-2X2-D805s (one 2.4GHz and the other 5GHz) mounted next to each other on a tower about 12-15m up in the air, pointing along a street in a city centre location - the aim is to give coverage to that street (I believe pointing slightly downwards). I've attached a photo - the antennae are mounted on the black rail just to the right of the chimney next to the flag pole.
When I stand in the street with a laptop, I can see both the 2.4GHz and 5GHz radios, with a dBm reported varying between about -46 nearby to about -62 about 100m along the street for both. However, whilst connections on 5GHz are fine and snappy, 2.4GHz is not very good - we normally have 40+ clients on the 5GHz radio all the time but only 1 or 2 most on 2.4GHz.
This could just be congestion on 2.4GHz (especially as it 's a city centre location) but there are other APs in adjacent buildings on 2.4GHz and those work fine if I stand near the windows of them.
Also, when I do a 'show ap arm neighbors ...' on the AP, I see lots of 5GHz APs about but no 2.4GHz APs. The web dashboard is reporting usage <1%, channel free 99%, channel busy 1%, channel quality 100.
This makes me think there is something wrong about the 2.4GHz installation (either the antenna connection or the controller) as I find it hard to believe it's that bad (and, even if the performance was bad, I think I would see some adjacent APs and more clients at least associating).
I don't believe there's anything wrong with the physical installation of the AP (based on what I'm told) and the APs look OK from my check with a laptop. Also, there is another situation in another location where I'm also not getting anything from the 2.4GHz radio, so I'm thinking it's something more general.
Is there anything obvious (perhaps software-wise) I should be doing before I hike up the tower?
Thanks in advance.