The difference in the above factors for the case of θ=0 is the reason that most broadcasting (transmissions intended for the public) uses vertical polarization. For receivers near the ground, horizontally polarized transmissions suffer cancellation. For best reception the receiving antennas for these signals are likewise vertically polarized. In some applications where the receiving antenna must work in any position, as in mobile phones, the base station antennas use mixed polarization, such as linear polarization at an angle (with both vertical and horizontal components) or circular polarization.
What type of programmin relies on vertical polarization? If you were to position your receiver closer to the ground what might be a negative of this placement? What is one use that would require an antenna to receive signals in various ways at once? If you were to develop a signal to be used with mobile phones what would be an effective antenna type? What would the antenna you are using take advantage of to allow it to work in multiple locations?