Assuming the elements really are 100 ohms, you can match 4 of them using
only 50 and 75 ohm coax. Off each element, a 1/2 wave 50 or 75 ohm section
will transfer the 100 ohm element impedance to the other end. Each pair is
T'd, giving 50 ohms at each T. From there, an odd 1/4 wave 75 ohm section
will transform the 50 ohms to 100 ohms. These 2 100 ohm points are T'd,
giving 50 ohms for the main feed.
The above seems easier than using the hard-to-find 35 ohm coax but there
must be other factors I haven't thought of that caused Decibel Products to
use it.
Roger Grady K9OPO
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