antennas and feedline

[jrob@epix.net]

Hi all,

     I don't have antenna modeling software and with the subject arising
recently, I became concerned. I am very much in the process of putting
up a new tower and antennas and wonder if someone can model these for 
me? The tower is 72' freestanding, @ 2' above tower (74') will be a 
Force 12 EF 420/240  4 element 20 monobander w/ 2 element 40 monobander,
and 6' above that will be a Force 12 4BA 12 element beam which consists
of 6 on 10,12,15 and 17 meters. Below that I plan to put an array of
slopers or whatever for 80 and maybe an inverted vee for 160, all 
attached to or near the top of the tower.  Anyone?????
     Also, I can get fairly new hardline locally here at a reasonable
price, but it is aluminum shielded and not copper. Also I would have
to make up my own fittings to accomodate this stuff. Is there really
a big difference in the copper/aluminum shielding to warrant my concern?
It is 50 ohm and the making of fittings,I suppose, wouldn't be a "major"
hassle.  Could really use some reliable advice before I get this up.
Thanks for reading this. 73, Jeff     N3MLV