Topband: Length of Hi-Z vertical wire

[Gary Smith]

I just received the shipment of fiberglass 
extendible poles today and before I 
replace my droopy old PVC verticals for 
the HI-Z 3 ele array. I'm wondering if 
anyone has experimented with the length of 
the elements and found better results. I 
believe the wire is 19' long and wonder if 
24' would make an objective difference in 
directivity or null?

These are heavy poles & 4' long each and I 
have to lift them upright so more than 6 
of them would be unwieldy for me to get up 
& inserted into the base, doing it by 
myself alone. If the extra 4' would be of 
help, I'm sure I can manage.

Thanks

Gary  KA1J