What is the least expensive way to watch over the air antenna tv while away from home?

I am looking how to easily and cheaply receive analog and or hmdi tv reception through an over the air antenna. I will be at an RV park for a week and want to watch news. I want something simple. My travel trailer has built in antenna system with coaxial connection. Is there something connection that I can plug into my MacBook Pro (2012) which will convert to the coaxial or a standalone antenna in the trailer or merely just plugged into my laptop?