HPR.0990 Antenna High Performance Antenna

HPR.0990 AM Antenna
High Efficiency Antenna for Commercial and Information Radio Applications

This High Performance Antenna
is the heart of the RadioSAFE System.

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The HPR.0990 Antenna’s capacitive
“Top Hat” design maximizes efficiency.

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The heavy-duty coil can handle hundreds of watts.

This high performance antenna offers a communication professional the ability to establish an AM broadcast signal more efficiently than before possible with a product of similar design and price point. Its 50-ohm resonant design requires only a matching transformer at its feed-point, eliminating the need for an antenna tuner (matching network). Designed to operate in conjunction with a horizontal groundplane, this antenna is compact and ligh weight, making it easy to ship, set up and install. It may be assembled in minutes, if required, for an emergency application.

Applications

Commercial broadcasters benefit by keeping their AM stations on the air temporarily via STAs following calamities. The antenna also has the FCC-required efficiency to serve as a full time broadcast antenna for certain low-power Class C stations and Class B/D stations above 1300 kHz. See power specifications below.
Emergency managers and other public safety officials can upgrade from a conventional antenna and broadcast a larger and stronger AM signal via FCC waiver / STA – especially valuable when power and communications services are compromised. The HPR.0990 technology is the heart of the RadioSAFE Emergency Broadcast System.

Licensing

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.

Specifications (*)

Click here for a detailed product overview, specifications and planning aids.

Figure 1 of 4

Frequency Band	Max Carrier Power 125% + Modulation Peaks	2:1 VSWR Bandwidth
1500 - 1700 kHz	220 Watts	+/- 5.5 KHz
1100 - 1500 kHz	210 Watts	+/- 4.5 KHz
800 - 1100 kHz	200 Watts	+/- 3.5 KHz
650 - 800 kHz	175 Watts	+/- 2.8KHz
530- 650 kHz	155 Watts	+/- 1.5 KHz

Figure 2 of 4

Figure 3 of 4

Figure 4 of 4

Typical HPR 0990 Vertical & Horizontal Radiation Pattern

(Feedpoint Elevated on 20ft Pole - 32 Radials [50ft] at Base of Support)

Related Links

Antenna Comparison Chart

Antenna Siting Recommendations

Radio World article: "ISS HPR.0990 AM Antenna Does a Quick Stand-In; Solving a problem for KNBI(AM) in Monterey.Calif." Dec 28, 2021.

The Source article: "High Performance Antenna Launches a New Era in Information Radio Broadcasting."

Examples

The HPR.0990 Antenna (left foreground) installed on a 10-story building in downtown Indianapolis by WFNI Radio 1070 operating on a temporary license (STA) at 180 watts. Resulting coverage is indicated on the map below.

The HPR.0990 Antenna (circled in yellow above) stands in as WJOI Norfolk’s tower is collapsed to make way for a new one.See "Tower Down! Norfolk's WJOI Maintains Operations with Quick Switch to New HPR.0990 AM Antenna," The Source, Sep 2019.