In article ,
"Meindert Sprang" wrote:

The best place for grounding is at the ATU. Grounding the TX is not
necessary then. If you only ground the TX, high RF currents will flow on the
outside of the coax from ATU to ground and as a result the coax will radiate
too.

Meindert
PE1GRV

One small caveat that I would make to the above is:

If the RF Ground should prove to be of maginally high in impedance at
the Tx Frequency, then the transmitter, if it is not connected to
that RF Ground by anything but the coax, the transmitter will then be
part of the antenna system, as it will tend to float above the RF Ground
by the impedance at the Antenna Tuners Ground Stud. This can cause the
radio to do very strange things, and on occasion can cause RF Burns
when the operator transmits with the ground connected mic hanger
disc in his palm. Alot more common in, the old days of, fixed tuned
channelized antenna tuners. Autotuners just aren't as efficent at tuning
the antennas as the fixed tuner cannelized tuners.

Bruce in alaska
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add a 2 before @