To upgrade, or not to upgrade, that is the question

It will be dependent on your streamer and associated system. It would be useful to know / see your system. There is a place for photos / identified your components under your user ID. Then you don’t have to keep entering the same info. As it is essential for most questions and answers.

I would install and inexpensive wall wart wifi extender next to your system with a decent Ethernet cable (DHLabs would be my recommendation). See how that sounds… may be no difference. My experience has been the sound quality is largely the result of your streamer.

I have two great systems, each running on wall wart extenders. I know of many $150K systems that do.

Some folks have used budget streamers and fiddled / invested in there network and connections. I think either way can get you there. I prefer a single box and no fiddling with the network. My systems run seamlessly through my wifi.

+1 @ghdprentice any decent Ethernet cable is gonna cost $$$ for 70’, so I’d get something like a good TP Link extender and the DH Labs cable is likely a solid choice as well.  Also, I was recently made aware of these Ethernet filters that seem to provide meaningful benefits and at only $50 may well be worth a try while you’re at it.  Best of luck. 
https://www.dxengineering.com/parts/dxe-iso-plus-2

A mesh router with a ViaBlue to a nearby node from it.

fuzztone +1

It's un-possible to recommend anything with this limited information. If you want a path to upgrade, we need to know the system. 

Can you connect a computer in place of your streamer and run some tests?  Link speed, ping . . . 

Ethernet cables improving audio is a debated topic.  IMO, you are already wired, which is much better then wireless and 70 feet is not very far for Ethernet at the audio streaming speeds.  Other will disagree.  If the testing shows a good link speed, I would look at other aspects of your system to upgrade but without knowing more can't comment.  

    I have a Bel Canto E1 streamer running into Hegel H360 integrated, Maggie 3.7's and Velodyne sub DD12.  I am pretty happy the with the SQ,  just wondering if screwing around with internet connections would be worth looking into.  I see once again that there are several opinions on the subject, which is good, that is how we learn things.  Thanks, people,  I will have to try some of your suggestions.

In my experience it’s the last meter or so that makes the difference as my guess it’s using a cable that is insulated/shielded better reducing EM/RFI before getting to the streamer with an improvement in lower noise floor. Simple and affordable test is buy a Supra Cat 8 cable and connect between your 70ft run to your streamer. If the end of your existing run does not go to a wall plate first, being plugged directly to your streamer, then just use a coupling to connect the two cables.