The Double Bazooka antenna is a single band antenna. The antenna is the perfect single band, low-noise, no tuner required, antenna.
It can be used with a tuner on different bands, however it will not be very efficient. My suggestion would be is to build one for the band you want to work, and then play with it from there.
160 meters is a good rag chew band only in the winter time and is very noisy in the spring summer and early fall months.
75/80 meters has a lot of different groups on at night and lots of nets and is good most of the time with maybe the exception of during the day.
40 meters is good for daytime nets but you have to tolerate the foreign broadcast folks at night. Good Luck!
20 meters is good for long distance hauls and sucks for short communications.
Don't forget about 60 meters and 17 meters or the WARC bands.
Maybe the thing to do is put up a long/random wire to listen around for a while. The antenna can be installed as a "flat-top" or an inverted "V"
Vertical antennas on the HF bands or only good for DX, and they really suck for regional rag chews. All the stations you will hear will have horizontal antennas not verticals, furthermore almost everyone runs at least 1000 watts. There are some stations that run 500 to 800 watts so it is important to get all your power into and out of the antenna. Audio quality is important also. Most folks you will hear have spent countless hours trying different mics and different settings to get the sound they want. For instance a ICOM 706 MKII G is going to sound weak with a stock microphone even though it has 100 watts output. An ICOM 756pro II at 100 watts output with a stock mic will have more punch because of the audio adjustments available in the radio. The same goes for all the other HF radios out there.
I have tried a lot of different antennas. Pre-made, Windoms, G5RV's (those really suck) and even a Butternut vertical, and various other wire dipoles. Out of all the antennas I have tried the homebrew "Coaxial Dipole" (aka double bazooka) has been the best, single band antenna. I use 4 full wave lengths on 75/80 meters. That is 2 full wave lengths on the radiator and 2 full wave lengths 6 feet above the earth ground counterpoise, and that antenna only out performs the coaxial dipole by maybe 10 percent in receive. In transmit.....the more wire...the more RF being spewed into the atmosphere. The atmospheric noise is more on my 4 wave lengths but it is less on the coaxial dipole. Makes sense...right? They are also cheap to make.
Here is a link on how to build a coaxial dipole. In the article they use 300 ohm ladder line on the ends of the coax. I use regular 12 gauge stranded wire. Why? because you can add more wire if you want to go lower in freq. Imagine if you had to splice 300 ladder line to make it longer. Now that sucks! http://www.bloomington.in.us/~wh2t/bazooka.html