[TowerTalk] 80m vertical size calculation

[V. Sciucka]

Hi guys
We at club station going to build 80m full size vertical. We have assembled
it on the ground and it is 22m (72,2ft) length. What we afraid is that
lowering and raising again procedure will be quite tricky. Therefore we
want to get into resonance as quick as possible. Reading all available
literature and web resources gives very different values in length: from
58ft to 68ft. What is recommended length to get to lower part (~3550) of
band? Material is aluminum tubes with bottom diameter ~4in and top tube
under 1in.
Second question, if I find antenna resonates lower than I need, lets say
3440 is there a practice or formula to calculate how long tip should I cut
off? Or just "cut a feet or two, raise again and see difference"
In the future, hopefully quite soon, this will be part of classic 4SQ.

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Vytenis LY5T