Using BasicRX

Howdy. I’m trying to use an N200 with BasicRX to demodulate signals in
the 140Mhz range. I’m a little confused by the documentation here:

and here:

Here’s my questions:

  1. With my (admittedly limited) experience it almost reads to me as
    though you need 2 antennas in order to demodulate complex signals, but
    that doesn’t seem right. Is that the case?

  2. Are there any python/grc files that demonstrate using the BasicRX
    this way?