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Tried the following things:
- made the 4221 modifications as suggested in link above (digitalhomes.ca) - made little difference to VHF, improved UHF channels approx 10-20% as measured by tv in arbit units.
- made a larger reflector (36") for 4221 - didnt make a difference.
- As I was trying the various combinations, I had moved the antenna down about 4 ft - -that brought in KGO/Ch7 nice and clear -- and UHF channels were down but still receiveable. Moved the antenna around to see if that made a difference -- turns out KGO/Ch7 is received better when antenna is not pointing right at the tower (323 true) - highest reception @ approx 318. UHF channels degrade but still receivable.
So I left it there for now and Ch-7 is ok so far with the signal varying by approx 50% over minutes (fading likely). It is a cloudy day in the bay area so that may have something to do with better signal reception on VHF (trop scatter ?).
If it is still not reliable, I will try the half wave dipole + combine the signals. I did notice that when I was near the antenna, the VHF reception improves by approx 20%.
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