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:
GENERIC HOUSEHOLD RADIO FREQUENCY INTERFERENCE (RFI) KIT
The RFI kit is designed to cure most household RFI problems. It contains ferrite toroids and beads selected to eliminate RFI from .1 to 300 MHz.The beads are easy to use, don’t require modification of the protected equipment and work in almost all cases, even when plug-in filters fail.
What is in the kit? Three 1/2" ID snap on beads, three 1/4" snap on beads, 3 wall wart filter rings to suppress noise and interference and a large 1.4" ID ring for AC power cord installation on RFI prone equipment like computers, Home Theater Systems, telephones, etc.
Plus full instructions in the RFI TipSheet. A $49.50 retail value if purchased separately.
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