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Azimov--
Your spring antenna looks like a tall loading coil. Do you suppose it would be possible to build a very small loading coil with two or three feet of magnet wire wound on a small-diameter plastic rod? Into each end of the rod a 0.020-in brass wire could be attached to which each end of the coil could be soldered. The top end could be cut to one or two inches and the bottom end to a connector such as I use in my antenna modification.
Another option might be to make an extended coil by wrapping a two-foot length of 0.020-in dia brass wire around a threaded 4-40 rod, using the threads as spacers. Unscrew the rod and there's the antenna ready to be installed.
Think these are worth a try?
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