I'm planning on mounting a vertical HF multiband antenna on the edge of my roof.
Due to the presence of a paved walkway and some other similar property constraints, I have no room for radials anywhere near the mounting area.
However, I do have a saltwater canal behind my yard.
This is a rough and not-to-scale rendering of the situation. The red tapered cylinder represents the vertical antenna. The green part is the yard. Then there is the seawall and the canal itself. The yellow cylinder would be a floating foil-lined tube to maximize surface area and maintain water surface contact as the tides rise and fall.
The base of the antenna will be about 10ft above the surrounding grade and the canal is about 60ft away from the antenna mounting point.
- Can this idea work to provide a good ground for transmission?
- How should I connect the antenna to this somewhat distant ground?
If I were just to try this without seeking advice, I'd run coax with the center conductor attached to the antenna base ground out to the floating tube, probably in some PVC pipe to protect the cable itself from the soil. Is that a reasonable plan?
I've tried modeling this in CocoaNEC, but the transmission line interface is broken and the project hasn't seen active development for a while.
I've considered mounting the antenna on the sea wall itself, but the surrounding area makes that tricky.