In message , Cecil Moore
writes
Sal M. Onella wrote:
... and it does for me on 20 and 10. I don't know how many sets of dipole
elements can be connected at the same time, but I think it's more than the
two I have up there now. Richard gave the number five. That's why I said
I'm going to try a set for 40m.

A fan dipole with elements for 40m and 15m doesn't
work well because of the resonant interaction
between those two elements of 0.5WL and 1.5WL.
Most hams I know use the 40m dipole also for 15m
operation with a tuner.

It may not work in the same manner as the paralleled dipoles for the
other bands do (ie where only one dipole is active at any one band).
But, of interest, do paralleled 40m and 15m dipoles actually work
'badly' on 15m? Obviously, the feed impedance and the radiation pattern
are likely to be a bit different, but (maybe with a tuner to help tune
things up a bit better) would the overall performance still be poor?
After all, the RF you put into the antenna has to go somewhere (even if
it's not where you expect it to be).
--
Ian