for describing curtain antennas, consisting of 1 to 4 letters followed by three numbers:

;First letter: Indicates the orientation of the dipoles in the array.
*"H" indicates the dipoles are oriented horizontally, so the antenna radiates horizontally polarized radio waves.
*"V" indicates the dipoles are oriented vertically, so the antenna radiates vertically polarized radio waves.;Second letter (if present): Indicates whether the antenna has a reflector.
*"R" indicates that there is a simple (passive) reflector on