Antenna types

</ref> Some "doublets" are carefully sized to ''avoid'' resonance, in order to make [[impedance matching]] less challenging. (The term is "doublet" is not strictly distinguished; many use it as a synonym for "dipole".<ref name=ARRL-AntBk-1988/>)

</ref> Some "doublets" are carefully sized to ''avoid'' resonance, in order to make [[impedance matching]] less challenging. (The term is "doublet" is not strictly distinguished; many use it as a synonym for "dipole".<ref name=ARRL-AntBk-1988/>)

; [[Dipole antenna#folded dipole anchor|Folded dipole]] : A typical '''folded dipole'''{{efn|name=word_folded_footnote}} is two half-wave dipoles mounted parallel to each other, a few inches apart, with the far ends connected. Only one of the dipoles is fed, and the second dipole connects straight through the center where the first has the usual feedpoint. The two-wire version is often described as a "squashed [[#large_loop_antenna_§_anchor|loop antenna]]", since the total length of wire is one wavelength, and [[antenna efficiency|efficiency]] / [[radiation resistance]] of the folded dipole is very high: 4× that of a single dipole,{{citation needed|date=May 2024}} analogous to the high efficiency of large loops. Any number of similar parallel wires may be added, with the efficiency rising as the square of the number of parallel wires; hence a three-wire folded dipole would be 9× more efficient.

; [[Dipole antenna#folded dipole anchor|Folded dipole]] : A typical '''folded dipole'''{{efn|name=word_folded_footnote}} is two half-wave dipoles mounted parallel to each other, a few inches apart, with the far ends connected. Only one of the dipoles is fed, and the second dipole connects straight through the center where the first has the usual feedpoint. The two-wire version is often described as a "squashed [[#large_loop_antenna_§_anchor|loop antenna]]", since the total length of wire is one wavelength, and [[antenna efficiency|efficiency]] / [[radiation resistance]] of the folded dipole is very high: 4× that of a single dipole,{{citation needed|date=May 2024}} analogous to the high efficiency of large loops. Any number of similar parallel wires may be added, with the efficiency rising as the square of the number of parallel wires; hence a three-wire folded dipole would be 9× more efficient. {{citation needed|date=June 2025}}

; 'V' antenna : When the two arms of a dipole are individually straight, but bent towards each other in a 'V' shape, at an angle noticeably less than 180°, the dipole is called a '''<nowiki/>'V'&nbsp;antenna'''. When the ends of the dipole's arms are about level with the branch point, it is called a '''<nowiki/>''flat''&nbsp;'V'<nowiki/>''', or a '''<nowiki/>''horizontal''&nbsp;'V'<nowiki/>'''; when its ends are much closer to the ground than their center branch-point, the antenna is called an '''<nowiki/>''inverted''&nbsp;'V'<nowiki/>''' ([[Lambda|'Λ']]). The inverted&nbsp;'V' is popular since it provides some of the good electrical performance of a dipole, but only requires one high mounting point, whereas an ordinary dipole requires at least two, often three. Due to [[counterpoise (ground system)|ground reflections]] the inverted-'V' tends to be mostly [[omnidirectional antenna|omnidirectional]], but depending on the center angle, can slightly [[directivity|favor the direction]] along the midline between the two arms of the 'V'.<ref name=Moore-2014/><ref name=ARRL-AntBk-1988/>{{efn|

; 'V' antenna : When the two arms of a dipole are individually straight, but bent towards each other in a 'V' shape, at an angle noticeably less than 180°, the dipole is called a '''<nowiki/>'V'&nbsp;antenna'''. When the ends of the dipole's arms are about level with the branch point, it is called a '''<nowiki/>''flat''&nbsp;'V'<nowiki/>''', or a '''<nowiki/>''horizontal''&nbsp;'V'<nowiki/>'''; when its ends are much closer to the ground than their center branch-point, the antenna is called an '''<nowiki/>''inverted''&nbsp;'V'<nowiki/>''' ([[Lambda|'Λ']]). The inverted&nbsp;'V' is popular since it provides some of the good electrical performance of a dipole, but only requires one high mounting point, whereas an ordinary dipole requires at least two, often three. Due to [[counterpoise (ground system)|ground reflections]] the inverted-'V' tends to be mostly [[omnidirectional antenna|omnidirectional]], but depending on the center angle, can slightly [[directivity|favor the direction]] along the midline between the two arms of the 'V'.<ref name=Moore-2014/><ref name=ARRL-AntBk-1988/>{{efn|