Another antenna experiment episode. This time with a more finished "product" based on KQ6XA Bonnie Crystal's BBTD (broadband butterfly terminated dipole). The improvement is mainly in the transformer where I have taken the characteristic impedance into consideration when winding the transmission line around the toroid in order to get a really good 16-to-1 transformer/balun. This has made it possible to realize the software antenna modelling (in NEC2) design. The design goal of this antenna is a wide bandwidth NVIS - Near Vertical Incidence Skywave (zenith wave) antenna, especially for the northern part of the northern hemisphere. However, since the bandwidth cover 1 to about 17 MHz it would work for NVIS anywhere on the planet.
More information on Bonnie Crystal's BBTD and other variants:
http://hflink.com/antenna/
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