FT 817 spare antenna

Hi,

operating from a high and windy hill at the weekend, a small kit bag with the whip antenna for my FT817 blew away (plus a couple of leads).  I was going to make up a temporary antenna with a piece of copper wire and have tried to calculate the resonant length for 145.500MHz.  At the risk of embarrassing myself 17cm is what I have come down too.  Any suggestions on the correct length (I can trim with the SWR meter) or on a home brew replacement design.  Lightweight preferably.

Thanks

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