dusty:
If you are having trouble generating your tvfool signal report in the first place, and you are using the interactive maps feature, just click on the
Make Radar Plot >> button at the upper right corner of the map.
http://forum.tvfool.com/showthread.php?t=14508
The term "balun" is a contraction of BALanced-to-UNbalanced. The 300 ohm port is balanced because it has two wires, neither of which is grounded; the 75 ohm coax port is unbalanced because the coax shield grounded.
Please let us know if adding the balun to the old antenna for your workshop makes it work.
Best regards,
rabbit