Carnmoney Hill was built due to what I've named the bowl effect. Newtownabbey is shielded from Divis by Cavehill, a rock outcrop in North Belfast - like a cereal bowl with a hill in the middle. Newtownabbey is sandwiched in the valley below and can't receive Divis.

The vertically polarised FM trnamissions are from the end-fed antenna at the top of the tower.

I've included an image of the next-door site known as Glencairn, Glencairn was the original site for television before Divis was built. These days the site is still broadcasting Channel 9 local television at 1kw. It's known today as Ballygomartin. The top of Divis is just visible to the right of the tower.