15 feet above a flat metal roofed building, (it a NVIS
antenna), and resonant at 6.2 MHz.
It is operated at 3.98 MHZ, 5.4 MHz, and 7.2 MHz


Here's your answer:
Freq SWR
3.98 3,240 (three thousand !!)
6.2 2.08
7.2 39.3

Details:
Used 4NEC2 (free)
5 meters above ground
Length of antenna = 11.62 m
Impedance at 3.98 MHz = 3-j710
Impedance at 6.2 MHz = 24 +j3
Impedance at 7.2 MHz = 54+j318
Limitation - real earth used vs flat metal roof


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73,

Rick K2XT