The antenna is built into it. They said that it is designed to be
used in most aircraft by setting up the aircraft type in a menu
drop-down. From what I could tell they have parameters programmed in
to account for the way the antenna senses through different types of
aircraft.

Hmmm... that sounds highly suspect. So they can "see" through solid
aluminum (even an aircraft coming up from beneath/behind you) and
perform the complex DOA calculations to take into effect the shifting
antenna pattern -- without knowing where on the glare shield you placed
the device? I would think moving the antenna even a couple of inches
would drastically change the perceived DOA.

But heck, as long as they are paying royalties for violating the laws
of physics, I won't complain if it works. I'm going to look forward to
some good lab reviews on this unit. [Now, if we could just figure out
how to convince half the planes at my home airport to turn ON their
transponders... G]