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Message: <blockquote data-quote="PaulR" data-source="post: 757223" data-attributes="member: 176256">In rough figures, and taking only the dish itself, a 1.5m dish has a surface area of just under 1.8 sq m and a 1.8m dish is just over 2.5 sq m which is under twice the surface area.  In order to get twice the surface area you would have to have a dish of just over 2.1m diameter!And then we come to decibels.  This is a logarithmic scale where a 10dB gain is an increase of 10 times and 20dB is 100 times.  A mere doubling is only about 3 dB which, as we saw above, would need a 2.1m dish.So 1.6dB gain looks about right.</blockquote>