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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High Performance Antenna
The HPR.0990 High Performance Antenna is the heart of the RadioSAFE System.
The heavy-duty HPR.0990 Antenna Coil can handle hundreds of watts efficiently.

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Downloadable Spec Sheet


Our Other AM Radio Antennas

Standard Antenna System

Free-Standing System with Tower

 Vertical Profile Antenna Support / Grounding System

This high performance AM radio antenna offers communication professionals the ability to establish an AM broadcast signal capable of reaching distances greater than before possible with antennas of similar design and price point. More than twice as efficient as comparable antennas, this high capacity antenna is compact and light-weight, making it easy to ship and install.
Frequency Range
Different versions of the antenna's design allow it to function on any AM frequency in the 530 to 1710 kHz range. Field tests prove that this antenna is capable of handling hundreds of watts, producing a coverage pattern that can exceed 20 miles in radius.
Common users are emergency managers and associated amateur radio operators who want to reach their publics during times when power, other communications and internet services are compromised. Commercial broadcasters can also benefit by using the HPR.0990 High Performance Antenna to keep their AM stations on the air temporarily at low power following calamities. And amateur radio enthusiasts who want a solution for special applications that can be installed in confined spaces will benefit.
Information Radio Station licensees can easily upgrade to the HPR.0990 Antenna. The antenna’s efficiency will allow a 10-watt signal to be produced that is two to four times that of the standard antenna, depending on frequency. A waiver is required from the FCC if an Information Station’s signal intensity would exceed 2.0 mV/m at 1.5 km (0.93 mile) by substitution of this antenna.
When utilized in association with an Information Radio Station for expanded coverage, i.e., RadioSAFE Wide Area Emergency Radio Broadcast Systems, a waiver and/or an emergency Special Temporary Authority (STA) from the FCC is required. Engineering and filings for the required waivers and STAs can be supplied by Information Station Specialists.
  • Power: up to 300 watts - 50 ohms.
  • Frequency range: 470 kHz to 1800 kHz.
  • Mounting Format: Top of support structure [tower, mast or pole]. Lower 36” of antenna base clamps in insulator mounts which can be attached to a vertical support with a round or flat surface.
  • Type: center-loaded, bottom-fed vertical, whip-type antenna with capacitive hat and adjustable vertical tuning section . Omni directional. Anodized aluminum finish. Guying ring.
  • Radiation efficiency: 54 mV/m/km (530 kHz) to 175 mV/m/km (1700 kHz). 45' tip height above ground on a 20’ metal support pole or tower with 50’ 32-element groundplane.
  • Bandwidth varies with frequency (3:1 SWR): 530 kHz: 6 kHz. 1700 kHz: greater than 10 kHz.
  • Temperature endurance: -40°C to 85°C.
  • Wind endurance: greater than 100 MPH, unguyed. Greater than 140 MPH with the addition of guy lines (nonconductive only).
  • Weight of the complete antenna varies with frequency. 30.5 lbs nominal. Mounts with insulators (2): 5.5 lbs total.
  • Overall assembly: five sections plus capacitive hat. Length varies with frequency and tip extension. Typical: 32'. Includes assembly hardware. Outside diameter of vertical sections taper from 2.5” (lower) to 1.0” (upper). Capacitive hat spoke length varies with frequency.
  • Recommended separation from buildings and structures: 100’ or equal to the height of the structure, whichever is greater.
  • Required options: matching transformer, stand-off mounts with insulators, lightning arrestor. Options: coaxial cable with connectors, guying kit, support poles and masts, roof stands, fully assembled groundplanes, unirods.
  • RF exposure separation: 1 meter minimum recommended for both occupational and controlled environments.
Accessory M990 Insulators with Stand-Off Mounts
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
      License-Free Stations News from The Source    
Travelers' Information Stations Operators' Zone
Why Customers Say They Buy

©  1983-2019  • Information Station Specialists, Inc. •  All Rights Reserved
PO Box 51, Zeeland, Michigan, USA, 49464-0051, Phone 616.772.2300, Fax 616.772.2966, Email Form

The USA's best known source for Emergency Advisory Radio Stations, Travelers' Information Stations, Highway Advisory Radio and related technical services.

 Trademarks: 2X Signal Booster, ALERT AM Emergency Advisory Radio System, ANXX AM Radio Antenna, 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, HPR0990 High Performance Antenna, i.A.M. Radio Transmitter, 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, SS3000 Free-Standing AM Radio Antenna System with Tower, Stylized ISS Logo, SX200 Watt Meter, Talking House AM Radio Transmitter, TR6000 Transmitter Model HQ5.0, TR6000 Transmitter Model 15.73, VoiceStar Portable Highway Advisory Radio Station (with or without Changeable Message Sign), VP9000 Vertical Profile Antenna Support and Grounding System, 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.