The relay mast on Borve Hill appears to be complete, as of today:
The lower dish points to the Loch Portain transmitter. The top antenna appears to be a 360 degree device. And it appears to be turned on as of today, as there's the distinct hum of electricity.
A few previous pictures of the mast under construction:
This mast is designated to serve the west end of the Borve metropolis on Berneray, as well as communities further out on the north side of North Uist.