-=> Quoting Jay Emrie to Mike Ross <=-

 JE> Don't forget about the vertical and horizontal polarization
 JE> of the transmitted signal!

 AM radio was vertically polarized from the early, early days
 of broadcasting.  The standard selected for TV was horizontal
 polarization because it was discovered that noise was mostly
 vertically polarized.  Thus horizontal polarization leads to
 less interference to the picture (which is an AM signal).

 Many, many years later someone came up with the bright idea
 that if most noise is vertical but some is horizontal, why
 not try circular (or spiral as someone called it earlier)
 polarization.  Lo and behold!  Even less interference to
 the signal.

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