This is exactly the same balun as used in our Spiderbeam Yagi antennas: a W1JR type coax choke with an extremely good balancing properties on 10 - 28 MHz and quite good balancing properties on 3.5 - 7 MHz. It is very well suited as a good allround balun for all antennas on this frequency range. Only high quality parts are used (Fair-Rite ferrite toroid, Teflon coax cable, rugged UV resistant plastic housing).
Note: all parts for one such balun are already included in all of our Spiderbeam Yagi antenna kits.
We are offering it here as a quality standalone product for any other antenna you may build.
For antennas with an SWR < 1:3 - up to 2000W
For antennas with an SWR > 1:3 - up to 1000W