There are a few things to consider when purchasing an antenna for your smart TV. The first is the range of the antenna. If you live in a rural area, you will need an antenna with a longer range than if you live in an urban area. The second thing to consider is the number of channels you want to be able to receive. A basic antenna will only pick up a handful of channels, while a more expensive one can pick up dozens or even hundreds.
The third thing to consider is the type of antenna. There are indoor and outdoor antennas, and each has its own advantages and disadvantages. Indoor antennas are less expensive and easier to set up, but they typically have shorter ranges and may not pick up as many channels as their outdoor counterparts. Outdoor antennas are more expensive but have longer ranges and can often pick up more channels than indoor antennas.
No matter which type of antenna you choose, make sure it is compatible with your smart TV before making your purchase.