There is correlation between length and diameter for impedance matching and
tuning. I.e. both length and diameter matter and one depends on the other to a
certain extent. Can you use some elastic wire that is insulated (sleeve or
plastic clad) and can be folded ? Ev. with an end cap of some sort ? E.g. toys
often use 'piano wire' antennas and they are commercial enough. The end is
either capped with a plastic blob or formed into a loop to avoid poking holes in
people and objects (such as packaging). If you use this pay attention to how the
antenna is secured to the board. An elastic antenna will try hard to cause its
solder joint to fail if soldered directly without strain relief and 
immobilization.

Peter P. 


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