11. As the wavefront of the ground wave travels along the Earth's surface it is attenuated. 12. Ground waves " do not " include tropospheric waves.13. Creeping waves greatly extend the ground wave propagation of long wavelength ( low frequency ) radio. 14. That is because digital ground wave broadcasting might move forward very rapidly in the United States. 15. Distance between the Relay Nodes were approximately 150 200 miles, determined by the ground wave transmission wavelength. 16. Ground wave propagation, the most widely used type at these frequencies, requires vertically polarized antennas like monopoles.17. Wet and moist sandy soils enhance the ground wave propagation, whereas dry and rocky grounds reduce signal strengths. 18. Ground wave radio signal propagation is ideal for relatively short distance propagation on these frequencies during the daytime.19. Ground waves propagate in vertical polarization, with their magnetic field horizontal and electric field ( close to ) vertical.20. In case of just ground wave reception a constant is included in the calculation if the distance is permanent.
