Coax Internet Cable: If I have to build one, what am I looking for exactly?

I took a look and the Jade FX-Ag is a very expensive cable.  It is also listed as using a very small 25 awg conductor, which means that the F-Connector is not a true F-Connector but an adapter that I would assume has a 18awg pin.

For much less money, I would look at the DH Labs D-750 which are available with F-Type connectors.   The cable is also a true RG6 design that uses an 18awg solid-core silver-plated copper conductor.

On true F-Type RG6 cables, the conductor itself is the actual pin that is inserted into the COAX socket.  The "F-Type" connector is just the ground shield and a "screw-on" assembly that holds the cable onto the connection.

On true F-Type RG6 cables, the conductor itself is the actual pin that is inserted into the COAX socket. The "F-Type" connector is just the ground shield and a "screw-on" assembly that holds the cable onto the connection.

The coax cable ground shield is also the current return path back to the source.

That’s why a loose and or corroded F connector connection will have an effect on the signal.

Example: Power flow in a coaxial cable

Note the signal does not flow in either the center conductor or the shield conductor but rather through the space, dielectric, between the two conductors. The signal travels in one direction >>>> from the source to the load in the form of an electromagnetic wave

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Thanks everyone. I went with @jea48 's cable recommendation in the first message: PHAT SATELLITE's solid copper core quad shielded. It was very affordable. In the future, I may play around with pricer cables here, but for now, I'm just eliminating bottlenecks. 

My purpose of looking into internet coax cables in the first place was because I wanted to hide the modem behind the furniture where it couldn't been seen. I made a simple isolation platform composed of a nice looking wood cutting board and some isolation feet by Hudson HiFi. Living room looks just a little nicer without the blinking black box visible (see my profile pic). 

Unfortunately, I can't tell whether the tweaks to the system sounds any different because I let my Qobuz sub go thinking Spotify HiFi would have been out by now. Because the tunes are all lossy, I can't say how meaningful the tweaks have been. 

One thought on streaming from the cloud: it seems plausible that having an internet coax cable with at least a solid copper core and some shielding would make a difference for A/V equipment. But I haven't heard any talk about this from digital HiFi reviewers/influencers. Just like having a dedicated power line is something more and more people are recommending, wiring the house with a coax cable containing a solid copper core could become gospel one day for good digital hygiene. 

I have had excellent results using a F-Type ground loop isolation, like this one below:

https://www.amazon.com/Ground-Loop-Isolator-Transformer-Eliminator/dp/B08FRGH4X2/ref=sr_1_17_sspa

It's different than the filter mentioned above.  I think the filter above uses Ferrite magnet filters which the conductor is looped through.

The link I posted is really an isolation transformer for the cable box.  I like it because it screws directly onto your cable modem or receiver.  You don't need two separate cables to place the filter inline.  This has significantly improved both audio and video quality.  However, it may not work in some equipment, especially if the equipment requires two-way communications.  It's cheap enough to try and you can take it out if you get internet connection problems or other weird things.

I couldn’t wait for Spotify HiFi any longer, so I picked back up a Qobuz sub, and I also picked up a Roon sub over the weekend. This is my first time using Roon, and I wish I had been using it for the last couple years. It’s a nice interface. Roon also did a good job simplifying the task of hosting a local server (the Roon Core), which I put on the laptop. Anyway, Roon is a different discussion.

As far as sound quality goes, I am happy with the sound again, playing losses files. But I’m not sure I can say the sound is better, or even much different, than what I had prior. With about a 1-1.5 months since I last played lossless files via Qobuz, I think there was too much time in-between to judge. Plus, I’m dealing with at least a few variables in addition to the new coax cable--namely, the modem and other equipment are now sitting on home-brew isolation boards, and I’m playing Qobuz over Roon rather than BubbleUPNP. At some point, I may A-B test Roon and Bubble to see if I can hear a difference since that’s simple to A-B test. I’ll wait to A-B test the coax cable replacement, which sits between the wall and the modem, once I get more time on the new copper core cable. If I do end up hearing a difference between coax cables, I may consider replacing the coax cable in the attic too. We'll see.