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I have noticed one thing about antenna height on 11 meters.  The higher you go the harder it is to talk skip.  At 150' I rarely caught any skip conditions closer than 1000 miles.  I talked all over the world but it was hard to talk within the United States.  Late at night talking (ground wave or whatever you want to call it) I could talk 150-200 miles barefooted.  I used to talk to mobiles in Pensecola, FL early in the morning.  After I dropped back to 100' that changed.  I could talk plenty of skip but the barefooted talking dropped to at best 150 miles.  It was a big difference. 

The best conditions I have ever had was when I had my M107 on the ground (bottom elements 8' off the ground) setting the reflected power and a person called to me from West Germany on channel 20.  I've got a QSL card to prove the contact. 

So how high is good enough?   At any given time it doesn't matter as far as I have seen.