I have had a hex beam for about 2 years, it has been about 20 feet from 
the ground on 2 sections of my tower mounted to the deck.  The rest of 
the tower will go up sometime this year.  Then I will have the hex beam 
up about 60 feet.  As it is, I have made contacts in Alaska Japan, 
Barang, which the last is about 5,000 miles away.  It always has tuned 
with the internal tuner in the Ts590, to a 1 to 1 swr.  It is the 6 band 
model 20, to 6 meters.  I have no complaints.  I have another antenna up 
about 60 feet, a maltyband antenna from dx engineering and the hex beam 
hears as well if not better and that is only at 20 feet.
I will write when the tower is up and let you know the differences.
Mike
KD2CDU