* In a crossed Yagi antenna, two yagi antennas are used to achieve circular polarization. Both the antennas are placed geometrically orthogonal to one another and 90° phase shifted signals are given to their feed. Hence it acts as a circularly polarised antenna. Usually this 90° phase shift is added by introducing an additional cable of length about 0.25*wavelength (actually the length also depend upon the kind of wire used. The phase difference due to transmission cable is its path difference times velocity factor which depends on cable). Weather it's RHCP or LHCP can actually be changed by changing its connections.

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