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The feedhorn also selects the polarity of the waves to be received, which helps to attenuate unwanted signals from adjacent channels and transponders, and from other communications satellites at nearby orbital position s. This can be either horizontal or verticalAn object is in a vertical position when it is aligned in an "up-down" direction, perpendicular to the horizon. Compare horizontal, spirit level The Vertical (or plumb line is the direction of the force of gravity. Therefore it is the most important refer if the polarization is linearThe word linear comes from the latin word linearis which means created by lines''. In mathematics, a linear function f ''x is one which satisfies the following two properties (but see below for a slightly different usage of the term): Additivity: f ''x +, or clockwiseClockwise can refer to: Clockwise and counterclockwise Clockwise (movie). or counterclockwise (also called left- and right-handed) if it is circularA circular may be: the adjective form of circle an advertisement which is circulated a Pastoral letter, Encyclic, or Papal bull that is circulated between churches a circular argument is a term for a type of logical fallacy where the very thing that is tr. Certain devices can also allow a feedhorn to accept both linear and circular, though these cause a slight insertion lossIn telecommunication, the term insertion loss has the following meanings: 1. The loss resulting from the insertion of a device in a transmission line, expressed as the reciprocal of the ratio of the signal power delivered to that part of the line followin to all incoming signals.

When used with a parabolic reflectorA parabolic reflector (also known as a parabolic dish or a parabolic mirror is a reflective device formed in the shape of a paraboloid of revolution. Parabolic reflectors can either collect or distribute energy such as light, sound, or radio waves. The pa or lens antenna , the phase centerIn antenna design theory, the phase center is the point from which the electromagnetic radiation spreads spherically outward, with the phase of the signal being equal at any point on the sphere. Apparent phase center is used to describe the phase center i of the horn is usually placed at the focal pointA focal point may mean the same as focus. Elements of an antenna: # driven element # parasitic element. The driven element is directly connected to the transmission line or source. In mathematics, focal point has a meaning of a critical point of a distanc of the reflector, with the 3dB point s of the horn's radiation pattern set to be at the edge of the reflector. On a satellite dish, the feedhorn is what is mounted at the end of a mast from the center of the dish, or on tripod legs mounted to the edge of the dish.

If combined with the low-noise blockconverter (LNB), the feedhorn is part of an LNBF.