While not necessarily THIS brand (Grumpy Old Guy "BUCK" at BUXCOMM even at his "customers") -- I believe this would resolve the issue (perhaps): My brother uses one on his "end-fed 160-meter long-wire" with the result being elimination of current on his microphone and other inside the shack equipment. It worked for him - and looks like it should solve your issues as well (IMHO). He runs up to 1,000 watts without ANY issues whatsoever (well, maybe not-so much 'whatsoever' - other than neighbors and their stereo amplifiers bringing his melodious-tones to their living quarters)!
"Coaxial in-Line isolator, 160 TO 2 METERS LINE ISOLATOR EASILY HANDLES 3000 watts.at HF."
Catalog Number: B2LISO
160 TO 2 METER LINE ISOLATOR EASILY HANDLES 3000 watts average power or 5000 watts SSB.
We (Buck - the Grumpy-Old-Man who proudly tells folks over and over of his exploits at Cal Tech (Yes, the one in California. Where else do they have a Cal Tech?) ... true as they may be) included, enough ferrite cores in the B2LISO for effective choking impedance. Our Line Isolation B2LISO BALUN is conservatively rated. It can easily handle 3000 watts RMS, and 5000 watts SSB. The ferrite material we use for the cores is made to our precise, wide band standards to provide optimum performance across the Amateur bands 160 through 175 MHz, No other line-isolator or UNUN can provide this level of isolation at these frequencies.
BUXCOMM B2KLISO coaxial in-Line isolator (B2LISO) tm is isolated by multiple, ferrite cores transformer. 1.5 to 175 Mhz. Made with Multi-Mix
Ferrite cores for wide bandwidth, and Ultra-low-loss (0.5dB @ 10 mHz) coax. See illustration and recommended application, this page:
The feedpoint BALUN or antenna UNUN may not balance the currents in the coax section feeding the antenna. However, lower down the coax line, closer to the RF output, a BUXCOMM B2LISO line isolator is added to reduce the common-mode current on the coax shield, thus reducing the radiation from the feedline between the isolator and equipment in the Ham Shack..
* Includes RG8X Coax Jumper.
* 5000 watts SSB, 2000 wts CW/FSK/PSK Line Isolator LISO Regtm BUXCOMM
* Input, connector, SO239
* Output, connector, SO239
An Isolator is installed at the output of the Radio, and/or if you are using a Linear Amplifier, it should be placed at the output of the amplifier.
A Line Isolator is exactly what it says: ..... The B2KLISO Isolates the Coax or transmission line from the Radio to perform two functions:
1) Prevent stray RF that may ingress into the coax shield from the nearby antenna radiation, And (2) Reduce spurious re-radiation or secondary radiation that may be a product of the random length of the transmission line.
As a result of number 2, many parasitics that cause TV Interference are reduced. Only a BALUN is to be used at the Antenna feedpoint. DO NOT use a Line-Isolator at the antenna feed-point.
When vertical antennas are installed above radial system, the feed-point impedance is approximately 44 ohms. When they are install without radials there are losses that enter into our equation that defeat the gain/band-width factor of our vertical antenna(s).
In addition, the feed-point impedance is no longer (approximately) 44 ohms. Some reduced VSWR may be noticed, however, the gain of the antenna suffers as a result of the antenna efficiency loss.
There is a reason for this effeciency loss; . because too often there is (RF) current introduced on to the feedline. To circumvent this problem with RF being induced into the shield of the coaxial feedline, we isolate the coaxial feedline from the RF currents from the antenna radiation, by inserting a "Line ISOlator" at the base or feed-point of the vertical antenna.
The BUXCOMM LISO (line isolator) inhibits undesired RFI by preventing feedline currents and re-radiation. In turn, the LISO forces all the RF energy from the transceiver, tuner, or amplifier, into the antenna. The BUXCOMM LISO2K does not require any further tuning.
The LISO2K works great with Windoms (ANY OCF), Dipoles, Bazookas, Sky-wires, and Loops. The BUXCOMM LISO2K is very broad-banded, and is effective from 1.5 to 175 mHz.
In all fairness - "Buck" was very instrumental in the research and development of what we now call 'HDTV'! A ham since age nine (as in "9") - Buck is at the magic age of '77' and has earned the right to be a bit 'brash'. He has managed to stay in business for many years while insulting customer after customer, many who return year after year to line his pockets by buying his well engineered, well made and sometimes 'crazy' wares! I like the old fart - he makes me laugh. He does, however, love to refer to what he considers the only accurate information on amateur radio products - HIS INFO - time and time again in the course of ANY conversation! He also has been awarded the "Most Domain Names for a Single Company" (fourteen) three decades in a row). No "Hi-Hi-OM" here folks -- just let out a REAL chuckle! BUCK would!