Replacing com antennas

I've ordered a pair of CI-291 Comant com antennas to replace the well worn
antennas on my Archer. Besides removing any oxidation where the aluminum
base contacts the aircraft and making sure the coax connector is clean and
serviceable and the mechanical connection robust, are there other mounting
considerations? For instance, is a conductive grease used between the
antenna base and the aluminum panel? Does Comant include any extra goodies
for the installation?

The 3 mounting holes in the new antennas are in exact alignment with the old
antennas. The interesting part will be backing the spinning nuts in the
tail cone while removing the outside screws. I should be able to capture
the coax with nylon ties to keep them from falling back into the fuselage
while preparing to mount the new antennas.

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Best Regards,
Mike
http://photoshow.comcast.net/mikenoel