Many of the newer TV's on the market are being made with no coaxial port and/or no digital tuner. This trend is because many people have discovered the joys of streaming content either through their new "smart" TV or using a streaming device so some manufactures are ditching the coaxial connection all together.
All is not lost. In order to use an antenna with a TV missing the needed coaxial port you can purchase a digital converter box. The converter box allows you to connect your antenna to the television AND they have built in tuners also. A digital converter box connects to your TV via HDMI or other means (make sure you know which connection you need before you buy) and allows the TV to receive digital TV signals. A digital converter box is a one-time purchase with no monthly fees. One converter box is necessary for every TV that doesn't have a built-in digital tuner and that receives its signal over the air with an antenna.
Digital converter boxes can be purchased at most big box retail stores, electronics stores and online.