In reply to M6WOW:
I am a big fan of the W3EDP. What little I have done with mine during activations (as opposed to just general /P), I have lashed the end of it to the top of the mast that Geoff 2E0BTR uses for VHF and stuck a T-network tuner at the other end (a lot of people say you should not use a T-network with a W3EDP as its too lossy when matching those kind of impedances). That way we can have one mast and two stations. There is ample sag in the wire to compensate for any rotating of the mast Geoff needs to do to direct his beam. In fact, you were my very first contact off a W3EDP while you were out with Geoff - I was using a configuration very similar to this (of course, Geoff was not at the far end of the wire!). Don’t let the poor conditions that day put you off this useful antenna!
I have modelled the W3EDP in MMANA, if you’d like a copy of the files for it I can email them to you. I haven’t looked at them for a bit, but I seem to recall that having looked at them I concluded a more efficient setup may be to arrange the 84/85ft radiator as an inverted V (particularly on the low bands). On the empirical side, I know that Brian G8ADD does this to good effect on the hill. So far as I can gather, the “counterpoise” can go where it pleases in practice.
Its interesting to hear about your Z-match - I suspect that the next ATU I build will be of the same configuration. I’d be keen to know how it works with the W3EDP on the hill (I suspect quite well).