Quote below.

The on-channel TDR pulse performance of a narrowband antenna can be seen by
controlling the RF bandwidth and spectrum span of the test process to fit
the application. The pulse (ping) itself is modulated onto an RF carrier
set at the operating frequency.

Not practical for most hams, but very useful in evaluating and optimising TV
transmit antenna systems.

If anyone is interested in seeing a jpg of such a measurement, pls e-mail me
directly.

- RF

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"Tam/WB2TT" wrote in message
What happens when you ping your antenna? Clearly the spectrum of the pulse
is wider than the bandwidth of a typical antenna, but is there any useful
information?