The ZS6BKW antenna is a better match for our bands than the G5RV. The method of construction and tuning is essentially the same for both antennas but the dimensions are different.
Here is the ZS6BKW antenna installed at AK6R fine tuned for the CW/FT8 frequencies on 40-20-17-12-10 meters. An excellent antenna when installed at 30 feet or higher and no tuner required avoiding the tuner losses and constant retuning. If you want to work all bands from 80-10 install an antenna tuner between the 1:1 balun and the amplifier and ignore the 39/40 switch.
Is this the best FT8 antenna? – I think so as I has made over 70,000 contacts and it still is a proven winner -Good world wide DX, easy to install, no tuner and takes full legal limit.
Here are several different 1:1 baluns you can use depending on power requirements:
This ferrrite Multi-Ring/Multi-Snap-On Combo Pack is a convenient solution for troubleshooting RFI/EMI (200 - 2000 MHz) with various diameter cables ranging from 1/4" to 1.4"/35.6mm for use as either single turn or multiple turn RFI filters using ferrite rings and snap-ons.
The filters are useful for RF coax, AC/DC power cables, and device interconnection cables. This frequency range is used in switching power supplies, variable speed motors, LED light dimmers and many other DC control circuits. Use on inputs and outputs of these devices to reduce or eliminate RFI.
Always use a snap on or ring with a larger inside diameter than the diameter of the cable and use multiple turns if possible (2 turns through the snap on is the same as 4 snap ons with 1 turn). Included in these combo packs are our most popular snap on sizes as follows:
Combo Pack includes the following:
F240-61 ring – 1.4″/35.6mm ID – 4 pieces
FSB61-1/4 – 1.4"/6.3mm ID – 6 pieces
FSB61-1/2 – 1/2″/12.7mm ID – 4 pieces
Normal Retail price is $106 for these parts - buy more than 1 set and save even more!
Use multiple turns thru the center for best results.
Here is the Coax Noise Filter used to suppress coax common mode currents (works for all type of antennas)
PDF of ZS6BKW at AK6R Construction Article HERE: My ZS6BKW Antenna