Perhaps I didn't state the situation well. I have no supports other than tree branches to put my antenna in. None of the trees are more than 50 or so feet high so something taller is not possible. I have to work with what I can "erect" with a "spud gun" raising a dipole might be possible but I wouod have to shoot both ends over opposite branches and pull the ends tight to get a dipole up. My understanding is a dipole has directivity and since one antenna for 20M at 40' max here has to suit all directions, I don't expect a dipole is the best attempt for me to attempt.
OK, got it. Then if you're limited by height, get the Zepp as high as possible. Anything over 35' will produce a low angled lobe that will work for most worldwide DX. IMHO, this arrangement will be superior to any other wire configuration (except perhaps a phased array, but don't see that is viable there at KA1J). Perhaps another can provide a simple model to compare performance numbers.
GL, 73, Rich, K3VAT