David wrote:

Scanners are notoriously over-sensitive. You need to get the receiver
away from the generator. Read the Part 15 advisory.

What is the Part 15 advisory?

And why would the sig gen work without an antenna attached one time but
not all the others if both were in the same room in the same settings?

Are you implying the scanner broke up the signal and captured it on
dozens of frequencies, or was the signal that got sent out somehow
broken up between antennas?

Please be more specific. Thanks.

Jeff