He claims it will noticeably improve both transmit and receive by making a quarter-wave monopole into a makeshift dipole antenna system. Per his instructions you basically add a short wire to the ...

and sometimes even the highest-performing antennas are little more than two lengths of wire. For this specific antenna, [W3CT] is putting together an inverted-V which is a type of dipole antenna.

Meaning "two poles," a dipole antenna is the simplest type of antenna, consisting of an electrically conducting wire or rod one half the length of the maximum desired wavelength. The wire or rod ...