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1.  Only if the antenna is purely resistive - which it is not.

2. Just my experience as said, YMMV.

3. You said the antenna was too short for 5/8 @ 27Mhz.  Why would you be making the radiator shorter?  You will be making it longer, which does increase the bandwidth.  Which is also how the manual says to adjust the vertical radiator.


Maybe there is a fault in the construction of the antenna.


You said you have 2 of them.  Try the other one and see if you get the same results.  Worse case, you lose a little time and have some expensive tomato poles.  Best case, you get the antenna to tune.


Many members here have setup and used the Maco/Workman 5/8 antenna and have been able to get it to tune quite well @ 27MHz.  It may not be a true 5/8, but you should be able to get it to tune.


IMHO, the closest that you will get to a true 5/8 is a Hygain Super Penetrator or for a little more, a Colossal 10K or an I-10K if you can find one.


Good Luck.