using $5 Monoprice coax cable now, what improvements would upgrading bring?

I wonder if I use the correct terminology. When I say coax I mean digital coax from the back of my Oppo into the DAC on my Halo.

thanks to all who responded

I should have just asked for a recommendation on a good digital coax cable that does not cost an arm and a leg.

:)

Ah.  Ok.  Here ya go...
https://www.amazon.com/dp/B01N6XL1XW/ref=twister_B01MUH69P1?_encoding=UTF8&psc=1

40 bucks and a very solid, neutral, and natural sounding digital cable with balanced connectors.  If you don't have balanced digital connections on your Oppo and/or Halo you'll need to get some BNC to RCA adapters.  Do not buy a true 75-Ohm digital cable without balanced connectors.  For $40 you can't go wrong with this. 

thanks soix

I am slowly learning...