Re: Antennas

["Bill Bowden"]

> But how can the AC current in the antenna be at say 550 Hz and 570 Hz
> at the same time.

There is only one AC current flowing which may be the sum of several
signals. But if the antenna is tuned, it will accumulate energy at the
tuned frequency and the AC current will be predominately at the tuned
frequency. Sort of like pushing someone on a swing. You give a slight
push at the right time and the swing goes higher and higher, which is
similar to the AC current in the antenna going higher at whatever
frequency it's tuned to.  

-Bill