I did some research a few years ago, and found an article that a guy wrote 
about multi-band antennas.  According to this, a balanced fed antenna of 178 
feet in length, is the best compromise antenna for operating from 160 to 10 
meters.  he used a modeling program, and averaged the gain and loss on 
different bands.  So that is what I am operating here.  Oddly enough, if I 
run the feed line from it's 40 foot height to the balon coil, it isn't that 
good.  If I add a non-resonant length of twin lead, making I think 85 feet 
it works about 10 DB better on most bands.  I can use the internal ts480 
tuner on 160, most of 80, and 30 and up.  You wouldn't have dog legs, an 
inverted Vee would be better, the higher you can get the center the better.