Rikoski wrote:
"How critical was the aiming of the antenna?"
Depends on the number of wavelengths in a side at the frequency you are
trying to receive.

Arnold B. Bailey in "TV and Other Receiving Antennas" gives data for a
typical rhombic on page 528. He shows a beamwidth of about 30 fegrees
with deep nulls on either side of the center lobe. Gain is 14.5 db over
a dipole or less. The rhombic is comparable to the parabolic antenna
Bailey shows on page 525.

Best regards, Richard Harrison, KB5WZI