This is a wideband antenna called a log-periodic, and it’s an array of dipoles of different frequencies. Yet again if you can estimate the size of each dipole it’s possible to work out the ...

Effectively this is an active antenna that uses a 555 chip or, in [Byon’s] case, a PIC chip to quickly shift between two receiving dipole antennas ... with the antenna array on his vehicle ...

The MULDIPOL ™ Multiple Dipole Collinear Array concept has been specifically developed by TACO for ground-air-ground, air traffic control and base communications applications. This omni directional ...