I had the following ready to post, but Otis just beat me to it with his latest. I’m not sure how they relate, but will post it as prepared anyway and compare laterAre we all happy that my lower blue line passes over the northernmost Transmitter mast or not ?
Speaking for myself – yes, now that you have clarified it.
As you say, the sightline is central to the discussion, and the relevant photos show that the sightline to the barracks clock-tower passes to the right of the northernmost transmitter mast, as shown by my red line in Reply#334, which means that your projected green line over Canterbury (Reply#327) is too far to the north-east.
Just how far depends on how far the sightline is to the right of the transmitter tower, and we can get an idea with some approximations which can be refined later if necessary:
Distance between clock-tower and transmitter = 18mm on 1/50000 scale map = 2950 feet on ground.
Distance to Canterbury = 15 miles = 79200 feet
Ratio between distances = 79200/2950 = 27-to-1, as near as ‘dammit’ is to swearing.
So, if my example of the actual sightline at Canterbury being 3000 feet south-west of your green line is correct (Reply#338), it will pass 3000/27 = 111 feet to the right of the transmitter tower.
If so, it puts those 6 balloons that I identified in the position shown in the opening post. But unless we can get more accurate measurements all that can be said for now is that it is all wide open and my scenario at Reply#325 is valid..
To finally decide we need exact measurements of:
1) Distance from barracks clock-tower to northernmost transmitter mast.
2) Distance from northernmost transmitter mast to Canterbury city centre.
3) Distance of sightline to the right of the northernmost transmitter mast.
4) A means of accurately positioning that sightline across Canterbury.