This tv only has an analog tuner (NTSC). That is why it works with cable and dvds. You will need a converter box to view OTA signals. (In addition, digital signals have a firm cut-off of signal strength; if the tuner doesn't get enough signal the channel will not be available.) So check with antennaweb.org or tvfool.com for details on the antenna direction for your area channels. antennaweb is very conservative in the channel listing it provides (even with the assumption of an external antenna). tvfool gives the color specifications of the antenna that should receive a given set of channels in your area.
The converter boxes are still available from select vendors but the government coupons program is not. Here's one that is listed as in stock: http://www.radioshack.com/product/index.jsp?productId=3150939&CAWELAID=198809366
. This is one of the standard definition output boxes. High Definition digital to analog converters also exist but are more expensive.
A cheap alternative may be to use a PC TV tuner (either USB or internal card) attached to the antenna and then output to the TV. This TV has a VGA port. (If you want to use component video in on the TV, you will need to check if your video card will support the non-RGB signal or a converter box for that.)
I wish that I could be of more help.
(many shows are available online either from the networks or from hulu.com)