The Double Doublet Antenna for 80 and 40 Meters

MFJ-17758 Dual Band 80/40 Meter Dipole Antenna – ATR

Multiband HF Center‑Loaded Off‑Center‑Fed Dipoles

Short 80- Through 10-Meter Band Ham Antenna, April 1973 Popular Electronics - RF Cafe

antenna construction - 3 Band (80-40-20 Meter) Fan Dipole Tuning Question - Amateur Radio Stack Exchange

Ham Radio 101: What is a Fan Dipole Antenna?

The All-Band Doublet

W3dzz 80m/40m (34m/1kw) at Radioworld UK

Hari Double Dipole 80/40m

Off Center Fed Dipole Notes - Palomar Engineers®

Portable Linear-Loaded NVIS Antenna for 40 Meters

Alpha Delta DX-80 Alpha Delta Single Band Full Size Dipole Antennas