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There are at least 3 models of the ATX Walkabout by Waters & Stanton.
1. Straight BNC base*
2. Right angle PL-259 base*
3. Straight 3/8-24 base

The coil base section of the ATX on both #1 and #2 models actually
have an RCA phono male inside, with adapters from female RCA phono to
BNC or right angle PL-259.

The straight 3/8-24 is much more durable, and can be used in
combination with other types of antenna hardware, such as mast rod
extensions, springs, or mobile mounts.

The 3/8-24 when combined with the Superantennas FT-817 side mount
provides the most stable and strong method for portable or pedestrian
mobile use.

Bonnie KQ6XA

Have you actually tried the ATX with a mast rod extension? Given that
the coil has fixed taps I wonder whether it would be possible to tune
it with a bottom section added?

Now that we know the ATX uses an RCA jack to mate with its connector,
it ought to be possible to insert a spring between the bottom of the
antenna and the connector, if one was clever enough to make such a
thing.

Julian, G4ILO