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I have made about 10 this year for 40-10 or specific freq.

I have found that it maybe good on 40, it will be slightly out of band on the others, especially if its tuned on 40 around 7.5 to 7.3 mHz.

I used minimum 1kv 100 pF cap close to feed point.

5 watt and 12 watt pictured.[ATTACH]40524[/ATTACH] [ATTACH]40525[/ATTACH]