Revisiting the coax
I believe our friend was right when he bailed on this idea. It's solvable, but not easily and not cheaply.
Ladder line: How do you control losses when the spacers get wet in the rain?
About any line used, but especially coax: Animals may chew on it!
It seems I didn't review the coax problem in sufficient detail. Here goes:
Belden 1859A has 3.1 ohms/1000 ft R on the center conductor and 0.7 ohms/1000 ft on the shield (1/4 ohms, 2 parallel.) For the total run, it's 9.5 ohms for a loop through both conductors. 4.75 ohms if power is fed from both ends. This is not prohibitive.
Loss at 73 MHz is 1.3 dB/100 ft, ~3.7 dB at 400 MHz and 5.6 dB at 720 MHz. So a 10 dB (700 MHz)-2dB (50 MHz) sloped-gain line amp every 200 ft would be required, with the run from the CM7777 being 400 feet to the 1st line amp. Some power would be required at both ends, fortunately these amps don't pull that much current.
Total loss at 720 MHz would be 140 dB. The way to reduce IMD is to limit signal strength. Filtering out the VHF/FM and cell phone, (and higher) frequencies may be required, and sloped-gain amps must be used, say 2 dB on 50 MHz to 10 dB at high UHF (700 MHz.)
I advised lower-gain amps spaced closer because then S/N ratio will be at its best, and overload potential minimized.
The gain structure is set up to maintain the antenna level at the input t o each amp. This will work well unless the signals are too weak at the antenna without a preamp. In such a case, 2 CM7777s can be used at the antenna, but beware of overload. (Overload is a potential concern with any preamp or line amp) If the signals are strong enough at the antenna, the CM 7777 and other amps could be moved down the line to attenuate them.
So:
ant-CM7777-400 ft 1st amp-600 ft 2nd amp-800 ft 3rd amp-1000 ft 4th amp-1200 ft 5th amp-1400 ft 6th amp-1600 ft 7th amp-1800 ft 8th amp-2000 ft 9th amp-2200 ft 10th amp-2400 ft 11th amp-100 ft run to house.
Signal at the house is 1-5 dB lower than at the antenna, with almost as good a S/N ratio. Another line amp could be used at the house, which might help with weak signals overriding the tuner noisse in some cases.
Unless the CM7777 overloads, I'd filter just after it, with as little insertion loss in the passband as possible.
Power at the antenna would be supplied by a small solar array, probably 5-10 Watts required, and an appropriate battery for nighttime.cloudy weather.
This is quite expensive!