The Hub to Wi-Fi RSSI is -60db and the Tempest sensor to hub RSSI is -98db. My guess is that hub to Tempest sensor connection is the issue.
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Ok, so worthwhile maybe starting with ensuring optimal orientation of the hub? Maybe some simple aluminum foil on the back of it.
This comment addresses which angle to position the original hub for best reception, and using a reflector to improve RSSI.
Since earlier in this thread I have repaired and changed the Sky, its solar power accessory and the position and arrangement of the hub and the wifi router angles. A few months back when I accessed the box where the hub is mounted I replaced it at a different angle and had intermittent problems between the Hub and the Sky.
Today I corrected my error which I can confirm healed my issue.
With the hub in the position of this photo the RSSI was over 92 and loosing signal.
There is aluminium tape stuck across the lid of the box acting as a reflector.
There is foam packing maintaining maximum distance from the reflector.
Note the position of the power supply to the hub is nearest to the wiring which was my mistake last time I accessed those wires to repair my camera power supply cable.
In this position with the pole leaning over the signal would be aiming down into the roof from this pic.
The following pic with the pole raised is taken from the direction of the Sky station several miles away. You can see the plastic box where the hub is mounted on the bottom left side.
The next pic is showing how I correctly re-positioned the hub which reduced its RSSI to 88.
The plastic box lid then folds over and screws closed.
So yes I still love my Sky stations.
(Before Sunny asks, the drain pipe with holes in it under the mounting board now houses an Air to monitor the temperature near the Tempest, which is not associated with this topic)
cheers Ian 
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