"Far Field" begins about 1 wavelength from the antenna, and for 1/4 wave antennas extends out several wavelengths in an area known as the Fresnel zone. For longer verticals, 1/2 wave for instance, the zone can extend out more than 100 wavelengths.
Remember that what you do in the near field to some degree determines the radiated field strength in the far field, but soil conductivity "out there" is a major player.
.....I have a all-band vertical with 50 43' radials and a few more at 55'.....
How are you feeding this antenna? Are you using your transceiver's built-in antenna tuner, or are you using a remote antenna coupler at the base of the antenna?