Coax Attenuation Chart
I would just use the rg8x for your application.
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RG8X huh? Let's see...100' of RG8X at 850 MHz has a whopping loss of 12.706 dB.
Just to illustrate the attenuation we are talking about in easy to understand numbers, if you put 100 watts at one end you would end up with a measly 5.363 watts at the other end. Uhhhhh, that's like 95% of your signal being thrown away! Why even bother to go to all the expense of purchasing and installing an outdoor antenna system?
I get the coax price issue, but there are ways to get hardline for free...yes free! If you were around when Nextel decommissioned their tower equipment, you could have probably managed to get a really good supply of 1 5/8" hardline in some very long lengths...by the hundreds of feet if that's what you needed. That's some big stuff that might be a bit too heavy for amateurs, but they dropped plenty of beautiful 7/8" hardline too. They were dropping and chopping that stuff up as fast as they could to turn it in for a meager percentage of the copper value. That is a waste of some very expensive high performance hardline! But that is how the industry runs...wastefully. And many tower crews would have gladly offloaded that stuff to get it out of their way. I have a garage full of all types and sizes. Most "new install" radio systems will only use new line, as qualifying the antenna system requires near perfect sweeps. It's not worth their time to mess with old line that may have had issues (but usually doesn't...at least for good long sections of it). And so old line that gets decommissioned, and removed from the tower so they no longer have to pay rent on the tower space, is usually scrapped. This is plenty usable by hobbyists who don't need "perfect" new line. Just watch for tower crews stripping towers of old antennas and line. But stay out of their way. They can't allow you to get near the tower work and possibly get injured. All it costs you is having a trailer to tow it away and some gas money. So now, how is that for "price"?
Phil