You're very welcome!
But, I'm not sure my points are getting through, so I'll give this another
brief try....
First off, you don't need a "tuner" for a receive antenna!
And, it doesn't need to be any specific length. Depending on your specific location / voyaging area, you may find using the lower HF bands (where a longer length, of 30' - 35' would be good), or the higher HF bands (where a shorter length of 15' - 20' would be good)....but, overall I've found a length of ~ 20' - 30' is a great compromise.
Secondly, you don't need a "pre-amp" (LNA) for HF reception!
Also, you don't need "big" or "low-loss" coax....especially if its "LMR-type" coax, as this is not a good choice for use near sea water and/or on a moving boat!
Third, turning off systems / devices on-board to use the radio?
Seriously?
Please forgive me, but this is pretty bad seamanship. Why not just get rid of the RFI, it doesn't cost much money (less than a decent lunch)?
Or, even better, just remove the offending devices?
(as you can see, I live in comfort, fridge/freezer, autopilot, lights, fans, stereo, lots of solar, wi-fi, etc....with NO RFI issues....heck, I can even run the diesel genset and run air cond if needed, with no RFI)
Fourth, in terms of Safety / Distress comms,
you made no mention of EPIRB (but assume you do have one, not PLB's, but a real EPIRB?).
But, you mentioned HF? But, you mention no HF-DSC? So,
please forgive me again, but without HF-DSC, a marine HF radio is not part of "safety system". 
And, you mentioned sat comms (iridium and InReach)....[yes, I also have an Iridium 9555 phone, and was a beta-tester for the original Iridium, back in the late 1990's]
But,
you do realize that neither an Iridium sat phone, nor an InReach are part of safety systems on-board, yes? They're not a substitute for an EPIRB, etc.
Further, the one thing that is weirdly overlooked here is that none of those are "broadcast" systems, like HF-DSC is....meaning the HF-DSC signal goes to all stations within range of the six int'l DSC signaling channels/bands (2, 4, 6, 8, 12, and 16mhz).....that's > 10,000 SOLAS vessels plying the oceans daily, as well as > 80 HF-DSC Coast Stations world wide, and > 450 MF-DSC coast stations....
Sat comm doesn't do any of that.{please remember, I LOVE sat comm....made a good living from it...and have been an Iridium user for many years, starting as a beta-tester ~ 25 years ago....but, these are not substitutes for HF-DSC comms>}Now, finally...to be clear, you do NOT need any of this....you do not need any of these systems, no wefax, no HF, no sat comm, etc...
My first circumnavigators that I met had none of these....and they only added a fixed-mount 25w VHF radio in Bali, when they were halfway around their circumnav! (this was in the mid-1970's)
And, on my first Atlantic crossing, we had no GPS (this was decades before GPS), no radar, etc....we did have HF maritime comms, though...
Okay, I won't ramble on, nor preach anymore!
You have the info you need, if you need more just ask.
(I just think some of what you posted sounds so way, way off from normal seamanship and good comms engineering, I wondering where/how did you come across these recommends? I hope not on-line, or "down-the-dock"? 'Cuz, there are official / engineering-backed sources for all of this, available for free! Just have a look, the real info is there for all, for free....and it works, works well, and is used daily by 1000's of vessels at sea, every day!
)
Fair winds.
73,
John, KA4WJA
s/v Annie Laurie
P.S. Matt, I'm not sure where you are located, but assume your location requires the charts covered by the NZ Met Service and the broadcasts from ZKLF?
Just hope you're aware that there are other HF WeFax weather broadcasts out there, too?
https://www.cruisersforum.com/forums/f13/good-hf-wefax-reception-on-board-at-the-dock-march-2021-real-world-248424.htmlhttps://www.weather.gov/media/marine/rfax.pdfAnd, be aware of ZKLF's "15 minute" round-robin transmit schedule ---- they use the same transmitter, changing bands every 15 minutes, with their 5mhz, 9mhz, and 13mhz freqs used 24/day....but, sharing the hour among 5 freqs, with the -45min to top-of-the-hour segment shared between their 3mhz freq used at night, and their 16mhz freq used during the daytime.
https://www.metservice.com/marine/radio-schedulehttps://www.metservice.com/files/documents/radiofax_schedule.pdfAgain, I hope this helps?
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Topic: General advice best antenna for Weather Fax on a yacht (Read 281 times)