OHMS?

The effective ohms will cut the original in half when you use two. One 50 ohm is 50, but two 75 will have effectively 37.5.

 

If you cut 75 ohm coax at 1/4 wave length of the freq you want times velocity factor of the coax involved usually 65 you get 50 ohms and what we call a tuning shunt so now what ever you put past that 75 ohm shunt will not be seen by the radio and think it has a perfect match. thus the reason you want to make sure your antenna are perfct before you put the 75 ohm coax on because other wise you could be talking into a resinant dummy load.
this would be 2468 devided by 27.185 then times 65% works out to about 59 inches on each side if my figures are right but its been a ton of years since i built any phase harness's.