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L band gain



Hello
My lesson in humility is over.  I need more gain/power.  If I put a 5 1/2 turn helix in front of a 36x30 primestar dish how much gain would that give me  on 1.268 Ghz ?  My current antenna is a directive systems DSH23-12 (12 turn helix) and is given as 14.5 dBic.
73 Bob W7LRD
Seattle
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