Bandwidth of Roomcap on 40m

Here you see the bandwidth on 40m, when the antenna is installed on the car.


Here you see, that the SWR has a value of 1.04 on frequency 7.1 MHz, and the setting of the resonance frequency is set to any frequence in the band in a few seconds.

An analyse of the antenna with calculation is here: Analyse / calculation



Wonderful Antenna

HF-Antenna = Roomcap

  • small
  • efficient
  • all bands 10m to 80m
  • radiator size = 1m x 1m grid
  • 50 ohm impedance – without tuner!
  • very slow flat radiation
  • does not need hight ( 1.5m above ground)


Here you see ein Link : Specifications / Test Reports