The KV-32FS100 only has an analog tuner (NTSC). Unless there is a low-power analog station still broadcasting in your area, you will not be able to watch OTA stations. (I've got one in my area that barely comes in.) If your local cable still sends an analog signal, you won't need a set top box to watch that subscribed service.
Otherwise, you need a set top box to watch TV. A digital to analog converter (the boxes that were available with the government coupon before the switch over) will give you over the air stations. The basic models only provide SD output; there are a few HD models available. Otherwise, you can use a satellite reciever, cable box (for digital cable service), or something like the Boxee or Sling with tuner. (There are a few different models of the Boxee; one added a tuner with a USB dongle. The newest model of the Boxee has the ATSC tuner built in.)
Note: OTA digital signal quality is either a strong enough signal for the tuner or no signal will be present. You need to point the antenna in the correct direction to receive the signal from your local transmitters. The type of antenna and its placement will also change the number of watchable channels. You can use antennaweb.org
to get more information. Antennaweb assumes an outdoor antenna but gives a conservative list of stations. If the signal is split to several devices, you may need an amplifier to get a watchable signal. (Sometimes amplifiers fail and you won't receive any stations, so test without the splitter or amplifier by using a direct cable to one TV.)
I hope this helps.