By the numbers:
(1) So how do I calculate lengths for other frequencies? ie 121.5MHz,
146.73MHZ, 123.0 MHz
By the proportion to the original frequency (this is called scalable).
This usually implies thickness too,

Thank you for the reply. Care to show me an example? I don't know which
lenghts are important, do I scale the radiator lenght, distance between
radiator and shorting stub, and / or shorting stub?

(3) Where can I finde a descent but cheap SWR meter?
Radio Shack.

I had checked at my local radio shack and the kid had no idea what I was
talking about. Walked around and said, "we must not have them." It's not a
very good store...only good at selling their toys, phones, etc. The Shack
isn't what it used to be. Can anybody recommend a brand / model for under
$100?

Thanks,
Carl