Priz wrote:
"I`m working with attic antennas and need some help."

The attic is a poor place for antennas but a good place to experiment.

A 60-ft. perimeter is over one wavelength at 15 meters.

According to Arnold B. Bailey`s "TV and Other Receiving Antennas" Fig.
8-14 on page 408, an open-circuit large loop has a radiation resistance
of less than 80 ohms. A closed-circuit large loop has a radiation
resistance of over 40 ohms.

A closed-loop`s radiation resistance varies less with frequency than
does the open loop.

Borrow the book. Look at the chart. Pick the radiation resistance you
want and proceed.

Best regards, Richard Harrison, KB5WZI