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.
Information Station Specialists Website     

America's Source for Information Radio Systems   |   Related Products   |   Technical Services
Radio Antenna Siting
Crowded antenna locations can result in reduced range.
Related Links

Operator's Zone Webpage

Planning an Information Radio Station

Technical Services Webpage
for Licensed Information Radio Stations
Marginal Antenna Placements

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

Superior Antenna Placements

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


Ideal Antenna Siting

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.
Lightning Protection
Destroyed Antenna Arrestor
Destroyed Antenna Arrestor that Protected System Electronics from Lightning Damage

Lightning protection is important. Though damage seldom occurs due to the fact that Information Radio Station antennas are not often installed high above the ground, lightning can strike them; and when it does, it needs to be directed to the ground so damage to connected electronics does not result. Information Station Specialists provides a lightning arrestor in every one of our systems that redirects lightning and generally will reset immediately so operation of the radio station is not interrupted.

The above photos show a rare catastrophic multi-pole lightning strike that occurred at the Information Station operated at Los Alamos National Lab in New Mexico in 2022. The antenna was totally destroyed (left photo) but the arrestor (pictured at right) protected the system’s electronics from damage, directing instead the charge into the aluminum plate and to the ground.

* * *
for Unlicensed Information Radio Stations
InfOspot Range Extender Outdoor Antenna and Tuner Setup     
Good InfOspot Antenna Setups Bad InfOspot Antenna Setups
                        Image 1                               Image 2                              Image 3                               Image 4                               Image 5

The InfOspot antenna and tuner should be installed in an open area, mounted to the very top of a pole or mast that extends above a support structure, 3-5 feet minimum. (See Images 1 & 2, above.)

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 as in Image 4, 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 (as in Image 3) above a support structure 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 that allows the tuner and antenna to be raised fully above the support structure.

Installation in the general vicinity of a much taller structure (as in Image 5) will limit the range of the broadcast significantly. Taller structures should be at least as far away from the InfOspot antenna as they are tall. (A 50-foot tree should be separated by a minimum of 50 feet, laterally.)

Contact Us All Products at a Glance Customer Support Policy All Services Site Index
Corporate Overview For Emergencies FAQs Customer Support Policy Site Map
Why Customers Buy For Health Applications FCC-Permitted Broadcasts FCC Frequencies & Licenses  
Founding & Firsts For Highways Glossary of Radio Terms Installation, Testing, Training
Privacy Policy For Visitor Information News & Stories from the Field Professional Recordings
  For Other Common Applications Operator's Zone Purchase Options
  For License-Free Stations Our Stations across the USA Rentals  
For AM Radio Broadcasters Planning Guide Streaming
For Amateur (HAM) Operators Planning Guide  

©  1983-2024  • Information Station Specialists, Inc. •  All Rights Reserved
PO Box 51, Zeeland, Michigan, USA, 49464-0051, Phone 616.772.2300, Email Us

TRADEMARKS:  2X Signal Booster, ALERT AM Emergency Advisory Radio System, AMReady Broadcast Components, 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, FlexPlane Preassembled Groundplane, Free-Radiate On-Premise Radio Broadcast System, 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, IP.8 Digital Message Player, IP.76 Digital Message Player, ITS.6000 Highway Advisory Radio Network, LIGHTNING LED Changeable Message Sign, Lowdown 630-Meter Band Amateur Radio Antenna, MGR.021 Digital Audio Management System, MXB.22 THEMATCHBOX Impedance Matching Transformer, NX8R Digital Message Player, PPFL PPFS 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, SMR Signal Measurement Radio Receiver, Stealth Sign, StreamCAST Internet Audio Delivery Service, SS.3000 Free-Standing AM Radio Antenna System with Tower, SX.200 Wattmeter, Talking House AM Radio Transmitter, TH.5 InfOspot Transmitter, TMS.020 Digital Audio Management System, TR.6000 Transmitter, TMS.020 Digital Audio Management System, TR.6000 Transmitter Model 15.73, VP.9000 Vertical Profile Antenna Support and Grounding System.

Information Radio Station is a generic term synonymous with Travelers Information Station (TIS), Highway Advisory Radio (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, wattmeter, 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.