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GP 40

¼ λ Glass fibre Ground-Plane Antenna for the 40 - 70 MHz Range
Description
  • GP 40 is a glass fibre ground-plane antenna of the triple-leg type.
  • The antenna is tunable (by cutting) within: 40…70 MHz.
  • The cutting diagrams below indicate the length of the radiator and the radials corresponding to a specific frequency. It is recommended to use the curves as a guide and fine-tune using an VSWR-meter.
  • The antenna comprises a brass GP-head, one glass fibre radiator and three glass fibre radials.
  • GP 40 is made of first-class materials and will endure “wear and tear” for years – no maintenance required.
  • LW-SS-1″ mounting bracket and GP Adaptor is available as accessories.
Specification
Electrical
Model GP 40
Frequency Tunable by cutting within : 40 – 70 MHz
Antenna Type Ground-plane
Max. Input Power 1000 W
3 dB Beamwidth, H-Plane Omnidirectional
Polarisation Vertical
Pattern Type Omnidirectional
Impedance 50 Ω
Gain 0 dBd (2.2 dBi)
VSWR < 1.2:1 @ f. res.
Bandwidth 1.5 MHz @ 40 MHz (VSWR = 1.5)
3 MHz @ 70 MHz (VSWR = 1.5)
Mechanical
Wind Area 0.075 sq. m / 0.81 sq. ft
Connection(s) UHF(f) (fitting PL 259)
Materials Elements : Glass fibre
Metal parts : Bright chromed brass
Colour White (RAL 9003) / Bright chrome
Historic Brand Amphenol Procom
Height Approx. 3200 mm / 125.98 in.
Wind Load 95 N (160 km/h)
Weight Approx. 1.6 kg / 3.53 lb.
Mounting 38 mm dia. mast tube (42 mm dia. as option, see note)
Ordering Codes
Model Product No. Model

GP 40

 100000165 GP 40

GP 40/42 mm

 100000167 GP 40/42 mm
Additional Information
Please Note

The GP 40 can be delivered with a GP-head for mounting on 42 mm dia. mast tube (standard is 38 mm) when ordering as option GP 40/42 mm.

The radiator is measured from its free end to the bottom of the black insulator, while the radials are measured from their free ends to where they meet the GP-?head.

Diagrams

CUTTING DIAGRAMS

PROCOM A/S reserves the right to amend specifications without prior notice
PROCOM A/S • Smedetoften 12 DK 3600 Frederikssund • Denmark
Generated : 2026-06-26 Version 1