08-07-2024, 08:31 PM
Hi Colin,
Contact between the wire and foliage will very likely be an issue on those bands where it occurs in the vicinity of a high impedance point. For example, I once erected a 40m EFHWA by simply slinging it over a tree branch, forming a shallow inverted-V shape, where the apex was close to the wire's centre. It worked fine on 40m, but not on 20m. Even though the wire was insulated (PVC), there was sufficient capacitive coupling to the branch to de-tune it on 20m, where the apex happened to be a high-impedance point.
Some tree pruning might be advisable.
73,
Chas
VK3PY
Contact between the wire and foliage will very likely be an issue on those bands where it occurs in the vicinity of a high impedance point. For example, I once erected a 40m EFHWA by simply slinging it over a tree branch, forming a shallow inverted-V shape, where the apex was close to the wire's centre. It worked fine on 40m, but not on 20m. Even though the wire was insulated (PVC), there was sufficient capacitive coupling to the branch to de-tune it on 20m, where the apex happened to be a high-impedance point.
Some tree pruning might be advisable.
73,
Chas
VK3PY