Say I have a wire antenna that is slightly (a few percent) too long for the desired frequency (of resonance or lowest SWR). What are the options, other than cutting the wire(s) and very likely ending up with an antenna wire that is now too short (by miss-measuring, or when re-strung, moved higher, environment changes, etc.)?
Can I fold the tips or the wires into a small flat circle or figure 8 (similar to a perpendicular capacitive hat)? Or loop the wire near the feed point? Or coil wire around a dowel somewhere in the middle? Etc.
Added: Is the answer different if the wire is insulated?