I have much used an AH-4 tuner in conjunction with an Icom IC-735
transceiver for 5 or 6 years or more. On all bands 160 to 10m.

The tuner has always been located at the base of various end-fed antennas.
The tuner control unit has always been bolted, as intended, to the side of
transceiver. The transceiver has been used in three different rooms, at
different times, in the house with varying lengths of control cable and coax
running through 1" holes in brick walls.

The control cable to the tuner has varied in length and distance from a few
feet to about 30 feet.

The system has always worked fine. No chokes, ferrites or anti-RFI measures
have ever been used. No RFI has been experienced. No faults have occurred
except that one dial lamp in the IC-735 has failed and I'm too old to fix
it.

The length of control cable has been varied simply by inserting a length of
unscreened, thin-wire, pvc-sheathed cable, 5/16" diameter, using soldered
joints and an open-to-the-air tag strip.

At present there is an excess length of control cable, of unknown length,
which is strewn around the floor, partly coiled up, at the back of a long
bench. But no TVI.
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Reg, G4FGQ