I've used Raspberry Pis for this, but they tended to be bulky and overkill - the "Banana Pi Zero" is what I've been using lately. Combined with a PoE splitter (some have micro-usb, you can plug directly into the board), this works great - no more coax losses!
I use one for SDR playing, and one for receiving OTA ATSC and streaming to Kodi. I suppose I could have also installed a USB hub and run them both (or more) from one board.