Stan,
Absolutely you can eliminate 6 m and put 20 m (or 15 m) by itself. I was more thinking Hans could add one more LPF space so you wouldn't have to eliminate a band. There certainly is PCB real estate to do that. However, I am not that worried about it. I am perfectly happy the way it is. A half (or less) S unit down is NBD. In fact, I often deliberately run my 12 V rigs at 9-10 V anyway.?
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73, Dan? NM3A