Jim, The 56:1 can be seen at the Myantennas website. They have a similar transformer with the 49:1 and state it can be in the horizontal L config. On the 49:1 kit there is a disclaimer on the band coverage. These are typically a 3 core kernel.
Fran?ois, A 49:1 is 2500:50 ohms and a 56:1 is 2800:50. Saying the "boxes" are 1:1 -- that is if fact absurd. The end to end testing is INSERTION LOSS. You may want to look at some articles at Ferrite Corporation on how insertion loss testing may be performed. My local club president was the chief engineer at Ferrite until he recently retired - he has steered us to many of their papers and videos over the years.
Andy
