I use a closed loop of approximately the same size. It is corner fed with
coax (don't know the length...probably about 20-25 feet). A MFJ tuner is at
the rig, and will match it all the way down to 80 meters. However,
performance is very bad below 14 Mhz.
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A closed loop is only effective on wavelengths roughly equal or smaller
than the circumference of the loop , so a 60ft equals 18.3 metres loop
should work well on frequencies 16 MHz or about.

For 14 MHz the loop would be best with a circumference of 21.5 metres
(70 ft) or longer ,etc

Frank GM0CSZ / KN6WH