I have gathered what is basically a Yo-Yo Tenna using some Camco laundry reels and a spool of cheap speaker wire split in half (pretty much exact duplicate of this build as it turns out). I've got a bit of equipment to measure the amount of noise the antenna absorbs to help tune it up, but I'm wondering more from a theoretical/antenna-design standpoint: what happens RF-wise as I roll the reels up?
That is, the idea of these antennas is simply a "wind up" dipole: two lengths of wire that can each be coiled up. Not only does this make the antenna nicely portable, but as the description of the Yo-Yo Vee claims:
Simply adjust bands or SWR by winding/unwinding the reels!
I've seen this to be true with my own setup too, I can unwind way less than the 100ft of each leg and get a higher frequency resonance. But what happens with the wound ends of the wire? Won't they form something of an inductor hanging out at each end? How would that inductance be expected to affect the efficiency and radiation pattern of the resulting antenna?