Just to let you know, I put together the 5 band pipe vertical using the cb whip antenna and it works great.
 I made it 34 foot and used 13 ground radials out of #12 copper insulated wire.  I use an mfj 929 tuner to tune it up.  Made contacts all over Europe all the way to Japan and Argentina from New Albany, MS.
 73's Jeff Staggs (K5ARE)

Update From Jeff, K5ARE
Experimental 80 meter add on

This is a quick way to add 80 meters to the 5 band pipe vertical that is half wave on 20 meters designed  by KL7JR.
I got my general license in October 2009 along with my kenwood ts-50 and a mfj 929 intellituner. I decided to make my own vertical antenna after I saw the 5 band pipe vertical on hamuniverse.
I have made several dx contacts with only 100 watts with the homebrewed vertical. Tasmania, Australia; Estonia; Japan are pretty good distances to make contacts without using an amplifier. 

What about 80 meters? 
One night at work I was thinking of an 80 meter add on that I could attach to the vertical that would look decent as well as perform good. I had about 200 feet of #14 solid copper wire still on the spool that I had gotten from Lowe's. I took the spool out to the antenna and attached it to the landscape timber with a wood screw.

I peeled back about 1 inch down to the bare copper wire and attached it under one of the clamps (of the vertical at it's base), making sure I had a good connection.  I did not unroll the aproximately 200 feet of wire from the roll. With my fingers crossed I went inside and turned my radio to 3.862 (Mississippi Net at 6:00p.m.). My MFJ 929 tuned that frequency to a swr of 1:4. I scrolled up and down the general section of 80 meters and it tuned just fine. I may could have gotten by with a shorter run of #14 wire, but hey I was just experimenting and it worked out just fine and performs well on 80 meters.  See photos below.

73's K5ARE from New Albany, MS