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Message: <blockquote data-quote="rolfw" data-source="post: 5564" data-attributes="member: 175057">Far too technical for me CH <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" />, without going into the maths behind the dish design I can't see how to settle the argument and as I have no real ability nor inclination to do those calculations, the fence is where it'll have to be for me <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /> . I also agree with P, why muck about with a monoblock anyway, when a steerable option is not much more expensive?Rolf</blockquote>