I’m confused on what you’re asking and I also don’t have enough info but I’ll try.

Normal household HDMI cables over 25ft you don’t want to use because you’re be losing a lot of signal. The best way to make this work would be to use a cat6 HDMI extender, with which you’ll have to buy a cat6 cable and terminate it on both ends after you’ve run it through your tube (aka conduit). Cat6 extenders for HDMI are good for about a couple hundred feet depending on what kind you get. Find out the distance you need and you even be able to get away with buying a premade Cat6 cable that can fit in your conduit.

Not sure if that’s what you’re asking but I hope that helped

Edit: Products to help out your search
Cat6 HDMI extender
Cat6 Cable