[quote=carl1010_1;4350133i know i could get away with a fair sized dish as am quite rural / good neighbours.
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The problem here is that if the dish is too large, the motor price shoots up. If you can get all the channels you want with a 90cm or 100cm everything is fine, as motors for this size cost peanuts - the standard cheapy diseqc model is the sg2100 for £35ish off ebay, which works superbly (made by moteck and loads of other companies).
Have a look at lyngsat and kingofsat, which catalogue all the channels out there. For example, if you wanted to get digitalb, you have to find which satellite it broadcasts on:
http://www.lyngsat.com/packages/europe.html
As you can see, it's on Eutelsat W2, at 16 east. If you then click on the satellite name, then on "lyngsat maps" at the top, you get this:
http://www.lyngsat-maps.com/ew2.html
It broadcasts to Europe mainly, and a small side spot to Madagascar (which obviously is irrelevant). Click on the Europe map and it shows that all of the UK is covered by 50dBW, which is a blisteringly strong signal that you can receive on even the tiniest dish. This is more or less the case for all the major satellite constellations: Hotbird @13E, Astra1 @19E and Astra2 @28E.
However, others aren't really aimed at the UK, and require increasingly big dishes. For example, Sirius 3:
http://www.lyngsat-maps.com/maps/sirius3.html
In Edinburgh I'm borderline with this and a 90cm dish - some transponders I can get, some not.
Generally most packages are on strong signals here, but with a motorised dish it's probably best to figure out what you might want in advance.