Field Patterns of Cylindrical and Biconical Antennas

We measured the field patterns by broadcasting a continuous wave (CW) signal from the roof of one building to set up a stationary field. Then we could rotate the antenna (on the roof of an adjacent building) and record the transmitted power as a function of the angle. The data were taken in three different ways to compare not only orientation, but also polarization. The results are below. Note the polarization charts. There is a torroidial pattern due completely to the effect of the polarization. Both the cylindrical-slotted and biconical antenna demonstrate this, but they are 90 degrees out of phase. That is, one has vertical polarization and the other has horizontal polarization. Compare the following charts.