I've been fooling around with different wire antenna configurations for a couple months now for 80m, starting off with a simple dipole at 30'....graduating to a full wave sky loop at 30', then to a full wave delta loop with the apex at 85', all with (in my opinion) less than satisfactory results. Especially with DX.
So, I took the delta loop down, and converted it into a 1/2 wave 80m dipole, made the angle at the apex as near to 90° as possible (for a good impedence match), and hung it back up at 85'.
NOW I have an antenna that really kicks some serious butt, locally as well as with DX. Maybe it's not as efficient as a vertical for DX, but I bet it's not far behind. There is a TH7DX at the top of the tower, that (might) be acting as some sort of top hat for this V, but I think it's probably too small to do much for 80m.
I have to agree with the 'experts' out there who say a dipole is a very good antenna if it can be gotten up high enough.
On a side note, I have been also experimenting with a 1/2 wave "helical wound" vertical for 80m I put together, which is nothing more than a 30' wooden "stick" with 120' of 12ga copper wire wound around nearly its entire length and a 3' stainless "stinger" on top.
With a 4' ground stake at the base of the antenna and 3, 1/2 wave radials oriented northeast, this crazy apparatus rivals the Inv V in received signal strength, but has much more "noise" coming in with the signal, which in my opinion, negates any possible advantage it may have over the V.
It seems to load well and the MFJ-989D tuner has no trouble dealing with the over 100 ohm feedpoint impedence. I did wind a few coils of coax at the base of the antenna and at the tuner, to help minimize the effects of this mismatch, but have yet to actually transmit with it.
In the opinions of others, is this type of antenna something worth pursuing further, or should I take it down and concentrate elsewhere with my "fooling around" (read that as experimenting) with wire antennas for the lower bands?