It may behave as a "dummy load" with a very poor RF pattern (if any at all) on bands other than 40, 15, or 6M. and likely not at all for transmitting on 80M.
Will it work on other bands? Yes BUT very inefficiently (high SWR, power limiting, poor RF output). Without additional matching components the Eagle One does very well on 40M, 15M, and 6M. Can it be made to work much better by adding a $300 - $600 tuner at the base? YES ABSOLUTELY. Will it work at all on many HF bands without modification? YES. But those are the extremes, and somewhere in a very wide "middle ground", all antennas are a compromise. If either of the above is true then the antenna cannot / should not be used. There are two things that are "show stoppers" with any antenna -Ģ) Does it not work at all (i.e. it will work and as you have more funds / time you can decide if there are things you'd like to add / change. This will keep all the segments fully telescoped and not sliding back into each other. Follow the suggestion in their manual to drill a small hole at each junction of the telescoping segments and insert a small j-hook made from #14 wire or similar. ANOTHER TIP: The Eagle One has a tendency to need re-extending the telescoping segments after high winds or extreme changes in temp. Two other hams in our club have the Eagle One and we have found that 80M is tricky but doable if you have either a large counterpoise or transmatch / un-un at the base. Once I have that I can post results here. Hoping to soon solve the 80M situation with a Palomar Engineers multi-tapped un-un balun at the base of the Eagle One. Due to the smaller size of my counterpoise (trailer frame) it will not tune on 80M (receives just fine though). Mine works beautifully on 40 through 6 meters, with best SWR on 40, 15, and 6M.
I use exactly the same components (Eagle One and Z100) only mine is mounted to the ladder on my camper trailer. The ground connection is the RF counterpoise for the simple vertical antenna. and that should all be grounded as you describe. Yes, you should connect the ground connection on the Eagle One to the copper / steel roof material.
I doubt five feet of coax to your Z-100 Plus tuner is going to make much difference. If you need to add a tuner at the base of the antenna later you can. Put it up on the roof as you originally describe here.
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