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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Radio Antenna Siting
Crowded antenna locations can result in reduced range.
Related Links

Operators' Zone Webpage

Planning an Information Radio Station

Technical Services Webpage
Marginal Antenna Placements for Licensed Information Radio Stations

Antennas surrounded by poles, wires, large structures or trees cannot generate their full signal potential.

Superior Antenna Placements for Licensed Information Radio Stations

Compare against these antenna placements, which are in open areas of a yard or roof with no lateral obstructions.

Ideal Antenna Siting for Licensed Information Radio Stations

The antenna may be installed on a 20’ pole located adjacent to a host building. We recommend a 50’ minimum separation between the building and the pole. (The pole may be provided by you or by us, depending on the contract.)

The building should have generator power backup, if the application is for public safety

The pole should be placed in the yard of a builiding, on a side in which there is minimal paving or sidewalks for the buried cable to cross . . . in a yard area with adequate room for the pole and buried groundplane (if required) . . .in an area in which obstructions taller than 20’ are farther from the pole than they are tall (ex: 35’ tall tree is at least 35’ away). See diagram below.

If there is no suitable ground location and if the building has a flat roof, the roof may be considered under certain circumstances. Consult with us.
Positioning the Antenna Near Obstructions that Exceed the Antenna Support's Height
Ground Installations:  the distance to obstructions (X) should exceed their height (Z) above ground.

Flat-Roof Installations:  the distance to obstructions (X) should be at least twice their height (Z) above the roof.

Antennas installed closer to obstructions may evidence signal degradation, particularly if operating on lower AM frequencies.
License-Free InfOspot Range Extender Outdoor Antenna and Tuner Setup
The InfOspot antenna and tuner must be mounted to the very top of a pole or mast which extends above a support structure 3-5 feet (minimum.) It should not be side-mounted directly to a support structure (wall, tower leg, gable, etc), allowing the antenna to parallel the support structure. The antenna itself also should not be allowed to parallel the mast or pole to which it is attached (see 2nd image from left, above). This will cause the antenna’s signal to be dissipated into the mast or pole.

For example, attaching the Range Extender Outdoor Antenna and Tuner to a short stub just above a support structure (roof, far left), or alongside a wall, eave, or gable, can yield less-than-ideal results. Instead, attach it to the top of a mounting pole or mast (two photos on the right) which allows the tuner and antenna to be raised fully above the support structure.

In the above examples, the reported range was less than 100 feet when installed on the short stub (left photo); when raised up on the mast at the same location (far right photo), but when raised and attached to a mast at the same location (far right photo), the signal could be detected more than a half mile down the road and covered the immediate property well.
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PO Box 51, Zeeland, Michigan, USA, 49464-0051, Phone 616.772.2300, Fax 616.772.2966, Email Form

The USA's go-to source for information radio station equipment, related products and technical services.

Trademarks: 2X Signal Booster, ALERT AM Emergency Advisory Radio System, ANXX AM Radio Antenna, AP.55 Digital Message Player, ENcast Emergency Notification Broadcast System, EventCAST Portable Information Radio Service, FAS.6000 Flashing Beacons & Controller, FASTrack Quick-Erect Sign, FlashCAST Internet Broadcast Service, Flashing ALERT Sign System, Free-Radiate On-Premise Radio Broadcast System, HearMoreInfo Internet Broadcasts, HPR.0990 High Performance Antenna, i A.M. Radio Transmitter, Information Station Specialists, InfoRadio Format, Information Station Classic, Information Station IP, Information Station USB, InfOSpot AM Radio Transmitter Station, InfOspot Drive-Thru AM Radio Station, IP.8 Digital Message Player, IP.76 Digital Message Player, ITS.6000 Highway Advisory Radio Network, MGR.021 Digital Audio Management System, LIGHTNING LED Changeable Message Sign, NX8R Digital Message Player, PowerPlane Preassembled Groundplane, RadioSAFE Wide Area Emergency Broadcast System, RadioSTAT Portable Emergency Advisory Radio Station, RE 2.5 Range Extender Outdoor Antenna and Tuner, RESPONDER 1 Portable Highway Advisory Radio System, RoadRunnR Portable Highway Advisory Radio System, SSD.20 Severe Storm Detector, Signal Measurement Radio Receiver, Stealth Sign, StreamCAST Internet Broadcast Service, SS.3000 Free-Standing AM Radio Antenna System with Tower, SX.200 Wattmeter, Talking House AM Radio Transmitter, TH.5 InfOspot Transmitter, TR.6000 Transmitter Model HQ 5.0, TMS.020 Digital Audio Management System, TR.6000 Transmitter Model 15.73, VoiceStar Portable Highway Advisory Radio Station (with or without Changeable Message Sign), VP.9000 Vertical Profile Antenna Support and Grounding System.

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