20 Meter Dipole Antenna.
The W2AU is the preferred Balun of Amateurs worldwide.
W2AU’s operate at a low VSWR from 1.8 to 40 mHz, and handle powers up to 2 KW PEP (at SWRs of less than 3:1).
W2AU Baluns are transformer designs with ferrite cores to provide 95% minimum coupling efficiency.
Each has a built-in lightning arrestor, hang up hook, and 600 lbs of pull-apart strength in a weatherized, rugged package using only stainless steel hardware and quality materials.
The 1:1 matches 50(75) ohms unbalanced coax to 50(75) balanced dipoles.
Each dipole is cut for near the low end center of their respective bands , i.e. 3.700 MHz. However, generally these antennas are broadbanded and it is not unusual for there to be an acceptable SWR of less than 2:1 across the entire band. 14 gauge stranded coated wire.