Information Station Specialists is the best known source of travelers information stations, highway advisory radio, advisory signs and services needed to reach motorists with public service information. Learn more about Information Station Specialists.
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Standard Antenna System
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High Efficiency Antenna System

Operators' Zone

Radio Station Maintenance

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Transmitter System

 Vertical Profile Antenna Support and Grounding System


Our standard antenna system produces a signal intensity of 2.0 mV/m at 1.5 km, the FCC maximum field level. That signal is typically strong enough to erect signs for alerting listeners at 3 to 5 miles. The antenna may be mounted atop a square or round pole of wood, metal or fiberglass. This antenna system is packaged with a factory-wired groundplane, pole mounts and insulators, a cabinet-protected lightning arrestor system and ground bus for lightning dissipation and groundplane connection. Components include . . .
Antenna Mount and Insulators Groundplane
A galvanized-steel mount allows the antenna to be attached to any type of pole, minimum 6" diameter or 6" square. Includes split-plastic insulator mounts and stainless-steel hardware. A groundplane is the copper wire part of the antenna system buried beneath the antenna support. Our preassembled PowerPlane Groundplane is placed in a 6"-to-12" excavation that extends outward 10 to 20 feet (depending on frequency) in all directions from the pad or pole base; it is covered with backfill. The groundplane consists of a central ring of #4 bare copper stranded wire with 62 radials that extend outward in a circular pattern. See how it's typically installed in this TechTalk article.
Lightning Arrestor, Enclosure and Ground Bus
Provided in a NEMA-4 cabinet, the lightning arrestor is bonded to an aluminum panel, which serves as support for lightning grounding and groundplane connection clamps.
  • Type: whip (vertically polarized, center loaded, base fed).
  • Power rating: 25 watts.
  • Length: 15 to 25 feet (specifications vary with frequency of antenna).
  • Weight: 8 to 12 pounds (specifications vary with frequency of antenna).
  • Wind rating: antennas 1230 kHz and above 100 mph, 80 miles per hour with ¼ radial ice; antennas 1220 kHz and below 80 miles per hour, 50 miles per hour with ¼ radial ice.
  • Assembly: 4 sections - base, coil, midtip and tip.
  • Position of loading coil: center section.
  • Joints: sleeves with locking. screws, sliding tip with locking nut.
  • Temperature: -40 degrees C to 85 degrees C.
  • Base pipes: aluminum construction, black finish color to discourage ice buildup; UV-resistant finish; architectural-anodization process #801; 1.5-inch diameter.
  • Coil: wound with copper enameled wire in white vinyl shrink tubing, 2-inch diameter.
  • Adjustable tip: stainless steel with locking nut, adjustable for SWR optimization, 0.5-inch diameter.
  • Includes written documentation of safe RF exposure distance per ANSI/IEEE C95.1-1992 standard by a professional engineer (PE).
Lightning Arrestor System
  • Provided in a weatherproof NEMA4 cabinet, arrestor bonded to an aluminum panel that supports the lightning grounding and groundplane connection clamps.
  • Capacity of 50,000 amps surge.
  • Clamping speed of less than 2.5 nS.
  • 2 UHF connectors.
  • Aluminum flange ground connection.
  • Quantity: single PowerPlane Groundplane System.
  • Radials in system: 60 to 120 (specifications vary with frequency of antenna).
  • Radial length: 10 to 20 feet each (specifications vary with frequency of antenna).
  • Radial size: #12 bare solid copper wire.
  • Bonding method: silver solder brazing with double weather resistant coating.
  • Bonding ring size: #4 bare stranded copper wire.
  • Lead: #4 bare stranded copper wire, 10 feet.


Note: Our optional 2X Signal Booster offers up to double the efficiency/range of the station’s antenna, allowing the transmitter to run at less wattage or allowing the signal to have twice the signal intensity at a given distance. It functions with upper-band (typ:1610-1700) antennas only and is recommended for federal government agencies that do not have a signal intensity limitation; also for any operator in a challenging environment that requires maximum signal intensity to cut through woods, buildings and obstructions. (Local government licensees must seek a waiver of the FCC rules to allow a signal intensity above the standard 2.0 mV/m limitation.)
Founding & Firsts Audio Control Methods Alert Stations across America FCC Frequencies & Licenses Site Map
Common Applications Case Studies Installation, Testing, Training
Emergency Advisory Radio FAQs Professional Recordings
Features Compared FCC-Permitted Broadcasts Rentals
Highway Advisory Radio Glossary of Radio Termis Streaming
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PO Box 51, Zeeland, Michigan, USA, 49464-0051, Phone 616.772.2300, Fax 616.772.2966, Email

The USA's best known source for Emergency Advisory Radio Stations, Travelers' Information Stations, Highway Advisory Radio & related products/services.

 Trademarks: 2X Signal Booster, ALERT AM Emergency Advisory Radio System, AP55 Digital Message Player, ENcast Emergency Notification Broadcast System, FAS6000 Flashing Beacons & Controller, FASTrack Quick-Erect Sign, Flashing ALERT Sign System, Free-Radiate On-Premise Radio Broadcast System, HearMoreInfo Internet Broadcasts, , Information Station Specialists, InfoRadio Format, Information Station Classic, Information Station IP, InfOSpot License-Free Radio Station, IP8 Digital Message Player, IP76 Digital Message Player, ITS6000 Highway Advisory Radio Network, LIGHTNING LED Portable Changeable Message Sign, NX8R Digital Message Player, Potential Interference Notification Services (PINS), PowerPlane Flex  Factory-Assembled Groundplane, EventCAST Portable Information Radio Service, RadioSAFE Wide-Area Emergency Broadcast System, RadioSTAT Portable Emergency Advisory Radio Station, Signal Measurement Radio Receiver, SpotCAST Internet Broadcast Service, Stealth Sign, StreamCAST Internet Broadcast Service, Stylized ISS Logo, SX200 Watt Meter, Talking House , TR6000 HQ5.0 Transmitter, TR6000 15.73 Transmitter, VP.9000 Vertical Profile Antenna Support and Grounding System, VoiceStar Portable Highway Advisory Radio Station (with our without Changeable Message Sign), Wireless Audio Link.

Information Radio Stations is a generic term synonymous with Travelers Information Stations (TIS), Highway Advisory Radio Stations (HAR) / Highway Information Systems & Low Power Radio Stations (LPR). Operation of the stations is governed by FCC Part 90.242 Rules. A FCC license is required. Information Radio Stations may be fixed or portable. Subcomponents may include transmitter, antenna and ground system, digital voice player, wateter, cabinet with conventional or Corbin locks, lightning arrestors for RF, power and telephone lines, coaxial cable. Most stations employ black maximized antennas to discourage ice accumulation and security measures to prevent unauthorized program access. Options include synchronization, battery backup, solar power, remote programming by local, network or telco, multi-station audio distribution via RF or LAN / WAN or wireless network.