Half Delta Loop Antenna

Diamond Loop Antenna Vertical

The low-angle maximum is scarcely affected. Over typical soil, the phase change occurs at launch angles around 15 . For launch angles below this, performance is seriously degraded. See Fig 1A. This poor performance occurs at angles comparable to the most probable arrival angles for sky-waves from distant stations. See Chapters 3 and 23 of the 18th edition of The ARRL Antenna Book for detailed elevation-angle statistics. Ed. For horizontal polarization over imperfect ground, the reflection...