Broad Band Terminated Dipoles (BBTD), Tilted Terminated Fold Dipoles (T2FD) and Balanced Termination Folded Dipole BTFD) antennas can be designed to cover a large range of frequencies between 1.8 30 MHz. Longer length antennas generally provide better low frequency efficiency but take up a larger footprint of land. One BBTD that has worked well at the AK6R antenna farm is shown below. Many other designs are available and can be found at www.HFLINK.COM as well as other internet sites. Your mileage may vary using this antenna, but as a general coverage antenna for ham and shortwave broadcast, the simplicity can’t be beat even though an individual dipole on a specific band may out perform this broad band dipole. Palomar Engineers has all the parts you need to build this antenna, so why not give it a try?

BBTD at AK6R 1024x726 - Broad Band Terminated Dipoles (BBTD, T2FD)

Depending on the source of the antenna design, different value baluns are specified. Our Bullet(TM) baluns in ratios of 9:1, 12:1 and 16:1 are excellent for this type of antenna as they are broadband from 1.8-61 MHz and will take up to 500 watts PEP.

442300399 - Broad Band Terminated Dipoles (BBTD, T2FD)

FSB31-3/8, ID=3/8", RFI Range 1-300 MHz, Bulk Pack of 10

Store/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHz

Product Details

MPN: FSB31-3/8

Initial Permeability (@ 10KHz): 1500

Material: MnZn

Max cable size - in/mm: .354/9.0

OD (A) - in/mm: .933/23

ID (B) - in/mm: .354/9

Length (C) - in/mm: 1.55/39.4

Z (ohms per bead - single turn 1 MHz): 18

Z (ohms per bead - single turn 5 MHz): 50

Z (ohms per bead - single turn 10 MHz): 81

Z (ohms per bead - single turn 25 MHz): 144

Z (ohms per bead - single turn 100 MHz): 240

Z ohms (per bead - single turn 250 MHz): 270

Ferrite Snap On, ID = .354 in/9mm, Mix 31, pack of 10 pieces for RG-8X, cables up to 3/8" OD

Likewise Termination Resistor values vary from 500-1250 ohms and we have a good selection shown HERE: