Bill B wrote:
"What would be the optimum given a 15x15 inch square space?"

Terman`s 1955 opus on page 929 says:
"In particular, a loop antenna responds much less to the electric
induction field than does a simple wire antenna of comparable intercept
area. This is of importance because electric induction fields
predominate in the man-made noise that causes disturbances in padio
receivers, and this explains in part the popularity of loop antennas in
broadcast receivers.

Best regards, Richard Harrison, KB5WZI