{
  "id": "meters:directional-antenna",
  "collection": "meters",
  "slug": "directional-antenna",
  "name": "Directional antenna (log-periodic or horn)",
  "summary": "Used with an RF meter or analyser to find the bearing of a dominant source, distinguishing a tower on one azimuth from a neighbour's access point on another.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "log periodic antenna",
      "yagi",
      "horn antenna"
    ],
    "measures": [
      "power-density"
    ],
    "bandCovered": {
      "minHz": 400000000,
      "maxHz": 8000000000,
      "label": "antenna dependent"
    },
    "priceBandUsd": [
      100,
      2000
    ],
    "detects": [
      "Direction of arrival of the dominant signal",
      "Whether shielding one facade will help"
    ],
    "cannotDetect": [
      "Isotropic exposure — a directional antenna deliberately understates everything off-axis"
    ],
    "buyingCriteria": [
      "Published antenna factor across the band, so readings convert to field strength",
      "Frequency coverage matched to the meter"
    ],
    "related": [
      "meters:spectrum-analyser"
    ]
  },
  "sources": [
    {
      "id": "fcc-oet65",
      "title": "OET Bulletin 65: Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields",
      "publisher": "Federal Communications Commission, Office of Engineering and Technology",
      "url": "https://www.fcc.gov/general/oet-bulletins-line",
      "year": 1997,
      "kind": "government",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/meters/directional-antenna",
    "html": "https://emfbase.com/meters/directional-antenna",
    "markdown": "https://emfbase.com/meters/directional-antenna.md",
    "collection": "https://emfbase.com/api/meters"
  }
}