Ken C wrote:

If I put a T-connector on my feedline and a 50 ohm dummy load on each
leg, does the transmitter see 50 ohms, or 25 ohms?

If one leg is not being used, what should be put there (if anything)
for the transmitter to see 50 ohms if the impedance of the other leg
is 50 ohms?

Ken KC2JDY

Case #1 two 50 ohms in parallel plus a transmission line 25 to 100
ohms and everything in between [VSWR = 2:1]. If there are no
transmission line effects [very short line] then 25 ohms.

Case #2 one 50 ohm = 50 ohms including transmission line effects.