Originally Posted by Devonboy
I always use coax in multiples of a half wavelength at the frequency in use, also allow for the velocity factor of the coax.
This way, there is less chance of the coax becoming a matching transformer and the potential for current flow on the cable itself.
Would you mind if I take exception to this? If the antenna is built properly and resonates at the proper 50 ohm impedance, then a 50 Ohm matching stub will result in the exact same impedance.
Remember your equation:
Zin = Z0^2/ZL
If Z0 = ZL = 50 Ohms then Zin = 50 Ohms.
Thus you can make the cable any length you want without harming the impedance match.