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Band II Panel Arrays
904 Series

Rev : 02 | Rev date : 11 Jan 2022

The 904 series of panels are designed as building blocks for broadband, high power FM arrays for broadcasting in the FM band (87.5 -108MHz).  Panels in this series include 904CP, 904CPX, 904HP, 904VP, 904HPS and 904VPS models.

  • The 904CP panels comprise a pair of horizontal and a pair of vertical dipoles in a square configuration mounted off a reflective screen. In this configuration RH or LH circular polarization is possible. There are four input connectors on each panel.
  • The 904VP and 904HP panels are supplied with either a vertical or horizontal pair of dipoles for vertical or horizontal polarization. Radomes are available for these models.
  • The 904HPS panel comprises a radiator dipole assembly mounted off a reflective screen. In this configuration vertical or horizontal polarization is possible. These panels have a single input connector to simplify the feed system. An integrated feed-point radome is supplied.
  • The 904CPX panels comprise two crossed dipoles mounted off a reflective screen. This configuration provides circular polarization. There are two input connectors on each panel.

The extremely low VSWR performance of all models together with high power capacity provides the broadcaster with the optimum solutions for multi-channel operation.
The design utilizes stainless steel radiators with galvanized screen and ensures a very long trouble free life, even when installed in remote hostile environments. All panels are suitable to be used as elements in an array on a 4-sided tower.
The 904 panels can be arranged to provide the required coverage for a particular service area. Array design can be carried out by RFS engineers.
Both directional and omnidirectional patterns are available and beam tilt and null fill can be customised to specification. Panels are fed through a power divider network that is designed to meet the power handling requirements of the array.


  • Full band (87.5 - 108MHz) operation
  • Low VSWR over full band
  • Ideal for multichannel use
  • Horizontal, vertical or circular polarization depending on model
  • Solid stainless steel construction, galvanized screen
  • Cyclone/ Hurricane rated
  • Optional radome available for icing conditions
  • Temperature range -40 to +60 degrees C available.

Model 904CP panel

Technical features


Product LineFM Antenna
Product TypeBand II (VHF) 904CP FM Panel Arrays

Electrical Specifications

Frequency Range MHz87.5 - 108
Gain per Plane of Polarization dBd4.5
Half Power Beamwidth Azimuth degrees65
Return Loss dB26
Impedance (unbalanced) Ω50

Mechanical Specifications

Input Connector4 x 7-16 DIN or
4 x 7/8" EIA Flange
Mounting (Standard) mm (in)4 x U bolts
Effective Area Front (full antenna) No Ice m² (ft²)1.26 (13.56)
Effective Area Side (full antenna) No Ice m² (ft²)1.03 (11.09)
Design Wind Speed km/h (mph)240 (150)
Pressurization Operational kPa (psi)10 - 25 (1.5 - 3.6) 7/8" EIA Version
Weight kg (lb)96 (212)


Material - InsulatorsPTFE
Material - RadiatorsStainless Steel
Material - Reflecting ScreenGalvanised steel

Horizontal Radiation Patterns per plane of Polarization

Vertical Radiation Patterns per Plane of Polarization

External Document Links