This type of antenna system can be complicated and expensive, as well as dangerous to install. We don't recommend that you buy one just for FM reception. If you should decide to put one up, enlist the services of a professional. If you already have one on your roof or in the attic then you should try using it. You will need to add a signal splitter if you want to hook it to your TV and radio at the same time.
Splitters are available at electronic accessory stores for only a few dollars.
The advantage of this antenna is that you can aim it at the station of interest. It boosts ignals in the direction it's pointed and reduces those coming from the side and back. This may be helpful in reducing interfering signals. KVNO's transmitter is in Northwest Omaha where the tall TV towers are located. Your antenna may already be pointing in the right direction.