In article , spam-no-
lid says...

Terry Casey writes:

Looking at some on-line alignment info, it looks as though for the
Freesat satellite the dish needs to point almost exactly parallel to
surface of the wall, which might attenuate the signal pretty badly
depending on things like possible refraction.
So long as it is parallel to or angled slightly away from the wall, you
shouldn't have a problem - the beam width is very narrow.

A guesstimate based on eyeballing a Google map suggest that the wall is
in a plane about 40 degrees counterclockwise from due south, i.e. about
140 degrees.
The satellite data says it is at 143 degrees, which would put it 3
degrees behind solid sandstone :-(


The satellite data will be WRT true north but, if the map data
originates from the Ordnance Survey, it will be WRT grid north, so you
may not be comparing like with like ...

.... and you did say 'about 40 degrees'! How accurate is 'about'? After
all, a 3 degree discrepancy could mean the difference between success
and disaster ...!

You may find this useful:

http://www.macfh.co.uk/JavaJive/Audi...SatelliteCalcu
lator.php

or

http://tinyurl.com/3afzpuw

This uses Google maps but, if you enter your OS grid reference or
PostCode, you also have the option of using OS maps.

If the position is not quite accurate, you can drag the dish location
around the map. At maximum zoom, the OS shows the outlines of buildings,
which might be particularly useful to you ...!

--

Terry