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In essence there is little inherent filtering or distortion in a
wireless link (other than frequency dependent absorption in the atmosphere), provided that
there is only one propagation path between TX and RX units. This can only be achieved by
ensuring that there are no reflections of the transmitted
signal arriving within the 'aperture' of the receiver. One of the few examples where this
holds true is for satellite to ground communications where the receiving antenna is a very
focused parabolic reflector pointing directly towards the satellite and there are no
objects (other than distant planets!) from which a reflection can arise.
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