"Roy Lewallen" wrote in message
...
In the inverted L or any antenna with a horizontal wire, there's
coupling between the wire and ground. The field from the horizontal wire
induces current in the ground under it. If the wire is low, the loss
produced by this current can be substantial. By putting an elevated wire
under the horizontal wire, you've changed this coupling to the ground,
plus you've introduced a new conductor into the antenna. Mutual coupling
between this conductor and the other wires will change the impedance.

Modeling will give a lot of insight into what all is going on.

Roy Lewallen, W7EL

Thanks, don't know why I hadn't considered "the rest of the half wave". Not
many options other than what I have up, so will pass on the modeling. It's
REALLY a very decent performer on 160, 80 and 40, and unobtrusive in the
summer.

W4ZCB