Total posts : 45366
Quote=12vman: The aluminum material I plan to use is sorta like a flexible straw. … Would the total outside surface area (in length) be considered in the electricial length?
IMO the corrugations will have little affect on the electrical length of this structure at medium-wave frequencies, and you’d be safe just to measure it from end-end for an effective physical length.
What an FCC inspector might say about it I have no idea.