Dipole of #12 Wire Using the ARRL 468/MHz Formula
Free Space
7.15 MHz
1 wire, feet
20   0,-32.727,0   0,32.727,0   #12
1 source
10,100,0
0 loads

MN says the 468/MHz wire is a bit short, resonating at 7.324 MHz.  This may be
due to the lack of capacitive end effect provided by wire loops and insulators,
which the formula takes into account but which MN does not model.