Hello Ron!
If you look at pictures of the old 707 or 720, you'll often see a
"stinger" pointing forward from the top of the vertical stabilizer. This
is an HF antenna.
There was often a stinger pointing aft on a wingtip of a 747 (before the
400 series aircraft). This, too, was an HF antenna. The 707-style
system worked pretty well; the 747-style had a *lot* of static due to
bleed-off from the aircraft. The antenna became an extension of the
airframe static dissipation system. This was (and is) a poor location...
Lyle KK7P
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