"erniegalts" wrote in message
...
The 2 metre band extends from 144 to 148 MHz. So if were cutting an
antenna for center of this band at 146 MHz would be 75 / 146 =
0.513698630137. So a quarter-wave vertical would be roughly .513
metres long, or 513 mm. (millimeters) or 20.2244 inches.

This is good math, but usually for a 1/4 wave radiator, 5% is subtracted for
velocity factor, leaving the basic 1/4 wave radiator for 2m at approximately
19".