IT IS UNMATCHED AND COMPROMISE ANTENNA NEEDING AN EXTERNAL ANTENNA TUNER. YOUR INTERNAL RADIO TUNER WILL NOT BE ABLE TO TUNE IT ON ALL AMATEUR BANDS. IT NEEDS A GOOD RADIAL FIELD AS COUNTERPOISE FOR ANY EFFICIENCY ON LOW BANDS LIKE 160M AND 80m. EFHW-8010-2K, EFHW-4010-2K, EFHW-7510-2K or any other model starting with EFHW.
This is an End Fed multi-band wire antenna that will cover all bands from 80 to 10 meters, including the WARC Bands, as well as 60m meters and MARS frequencies. It utilizes a 9:1 UNUN transformer in order to bring the impedance of an antenna to more manageable values for your antenna tuner. It is a great antenna for HAM radio operators living in HOA controlled housing, HAMs desiring a very stealthy RV antenna, Field Day operations, sail boats, portable operating, backyard installations, ARES, RACES, etc. NOTE A wide range tuner may be needed to tune this antenna on 80-6 meters.This antenna can be used on 6M but it is not practical... Use appropriate antenna for 50MHz like Yagi, Vertical or simple dipole instead. 9:1 UNUN wound on two (2) 2.4-inch Ferrite cores in the stack with PTFE #16 AWG stranded Silver plated wire in order to reduce loss due to skin effect on higher frequencies.
#16 AWG wire with end insulator. Terminated into 450 Ohms load (RESISTOR), VSWR on 9:1 UNUN is almost flat from 1-30Mhz (see the measured diagram in gallery).
It has very low Insertion loss, from less than 0.1dB at 1.8MHz to 0.25dB at 28MHz, additional loss of a whole antenna could be expected from mismatch on coaxial cable and Tuner losses (see the diagram at gallery of S21 measurement of two back to back 9:1 UNUNs). It takes only moments to deploy the antenna.
Pull the wire end into a tree, hang it off the balcony, lay it on the roof, hook it to a pole, hook it to a building, etc. And you are on the air and making contacts. Most HF ham bands can be tuned by the tuner in your radio. NOTE: to tune all HF ham bands an external tuner may be required.T could work without counterpoise (Coaxial cable has to be at least 25feet long) but grounding at wing nut next to connector is recommended. This antenna can be hung in many different configurations. It can be hung as a sloper, an inverted L, hung in a straight line, zigzagged, vertical, horizontal, etc. Antenna polarization is determined by your installation. Vertical, horizontal, or both can be accomplished.
Due to possible common mode currents on your feeder we recommend using CMC-Common Mode Choke/Line isolator reduce RF away from you and your equipment. It will also help you on receive by filtering induced noise from various sources. No guarantee or liability is either expressed or implied pertaining to damages to persons, buildings, or equipment in the installation or use of our antennas.
You must use extreme caution when working around power lines. If the antenna were to come into contact with a voltage carrying line it could be fatal. The item "HF End Fed Antenna 1500W 80-10m / Ham Antenna with 91 dual core UNUN / 44 feet" is in sale since Saturday, April 13, 2019.This item is in the category "Consumer Electronics\Radio Communication\Antennas\Ham, Amateur Radio Antennas". The seller is "myantennas" and is located in Tampa, Florida. This item can be shipped worldwide.