[Elecraft] Home made Sigma-GT5 & KRC2 or SGC?

[jeff_elecraft@burnshome.org]

I am evaluating ways to improve my antennas. My current arrangement is
losing 3 to 6 db because I am using the KAT2 to tune a non-resonant antenna
fed with coax. Routing open wire line is problematic so I am considering
matching at the feed point.  

The Force 12 Sigma-GT5 looks interesting, but I would like to cover 30 and
40 meters. It should be possible to make a matching network similar to the
Sigma-GT5 for either the Sigma 40 or 40XK. The KRC2 Band Decoder could
switch the relays. How hard would it be to make this network and get it
working? Would I be money and time ahead to just buy a SGC tuner and mount
it at the feed point? 

How does a SGC tuner interact with the KAT2? I do not want to just put the
KAT2 into bypass because I may be using it on the other antenna port.

Also, is there anything about the Force 12 Sigma antennas that would be
difficult to fabricate at home? 

I am also considering a BigIR 40m to 6m vertical, but I really do not have
room for many radials. How will a BigIR with minimal radials compare to the
vertical dipole? 

Jeff Burns
AD9T