IIRC his only national TV appearance (other than the commercials) in
the early 80's was when Andy Kaufmann hosted the Midnight Special and
had Slim on as a musical guest:
http://www.youtube.com/watch?v=JH64weKPF60
I was unable to find the ad for his first Greatest Hits album, the one
that was played repeatedly on TV in 1980; that album was called "All
My Best", I guess this was the ad for his follow up album:
http://www.youtube.com/watch?v=w15nr7A3vN8
And don't forget about how the music of Slim Whitman saved the world
in Mars Attacks:
http://www.youtube.com/watch?v=-MhgnMX73Pw
I remember when people used to buy his album off TV and give it to
friends as a gag gift. There was a time in the late 80's I was in a
record store (back when they had them) and I was going thru the bin of
one dollar cassettes and came across a Slim Whitman greatest hits
cassette, which I purchased. It came in very handy when the neighbors
played their music too loud; I would turn on Slim and crank it all the
way up and after a minute or two the neighbors would turn their music
down.
He must have made a boatload of money off those TV albums; I've always
wondered who greenlighted that whole idea of saturating every TV
market in America with ads for a greatest hits album by an obscure
yodeler.
When I was in radio about 15 years ago, a bunch of us were sitting
around one day and we got to talking about Slim Whitman, and the
statement in his TV ads that he was "bigger than the Beatles over in
England." I started looking into this, and found that his hit "Rose
Marie" held the record for many years for most consecutive weeks at
the top of the British pop charts, and the record was not broken until
that horrible Bryan Adams song from the Costner Robin Hood movie from
the early 90's.