Reverting back to a 2.4GHz design proved to be the best solution, and I was able to verify that the Cisco-1532E AP’s suffer with a bug, in that when you enable sntp, after the device has been primed for use with 5GHz, it reverts back to it’s -UX domain. 😬
The outcome was great as 2.4 managed to overcome the dense foliage in the Northern Kimberley town. The link between the Power Station and two point of sale locations, all good!
Typically I wouldn’t use 2.4 due to the mass adoption in built up areas but this is remote outback Australia.
The Power Station 
Trees in Path 
Far End 
Job done!
MystaJoneS 