I have two of Ringo Rangers and as far as I know it is fine tuned for
vhf and not uhf, I was wondering since it could be fine tuned for a
specific frequency maybe it could be modded to support 2.4 Ghz.

I really have no idea about antenna's aside from the cantenna articles
I have read. Most of these have built in calculation tool on what the
length should be according to the circumference of the can.

Thanks in advance