In message , Jeff Liebermann
writes
On Sun, 17 Nov 2013 22:26:53 +0000, Channel Jumper



This is the reason why television is horizontally polarized.

TV is horizontally polarized because the first FM operated in the
42-50 MHz region, where horizontally polarized antennas were more
common. A vertically polarized 30 MHz Yagi would be quite
impractical. The first TV stations were 44-50 MHz, and later moved to
50-56 MHz. Same problem... a vertical Yagi would be too big. There
are some other reasons if you want more detail.

In the UK, we longer use VHF (low-band and high-band) for TV (it's all
now on UHF). However, when we did, around 50% was vertical and (of
course) 50% was horizontal. The very first BBC transmitter (in London,
opened in 1936) was actually vertical, on 45MHz (they were rather big,
especially at ground level!), and remained so until VHF closed in the
late 80s. With only one or two exceptions, all high-power UHF is
horizontal, but quite a few lower-power fill-in transmitters are
vertical (to minimise mutual interference).
--
Ian