Analysis of Airborne VHF Incidental Noise over Metropolitan Areas-Part II: Horizontal Dipole Antenna

Computation of the incidental, quasi-peak electric field intensity detected by an airborne, tuned, horizontal dipole antenna has been performed using a symmetrical representation of measured, surface man-made incidental radio noise data and the radiation field integral for the observed power at a height, h, above the surface. The derived electric field intensity as a function of observer altitude is compared with the results of four sets of measurements obtained over central Tokyo by Ishida for heights lying between 0.3 and 3 km. The comparisons reveal that the dependence upon altitude of the predicted quasi-peak electric field strength agrees with the observed trends and, further, that the measured and predicted field intensities display an average difference of less than 0.7 dB. These results and experimental comparisons for a tuned, airborne, horizontal dipole antenna complement the experimental confirmations of a comparable analysis previously reported for vertical, tuned, airborne dipole and monopole antennas.