The AOC Envision A17W221 only has a NTSC tuner (analog). If you are using an OTA antenna, you probably need a digital (ATSC) to NTSC converter box to get any TV signals. These include the ones sold with the government coupon at the switchover. Very few analog stations still broadcast; they were limited to low power transmitters. Thus you need to be close to the transmitter to receive a watchable TV program. For the best signal to the AOC A17W221, connect the component video out on the converter box to the component in on the TV. The specifications for the A17W221 are available on the Amazon sale page,
https://www.amazon.com/International-A17W221-17-Inch-HD-Ready-Panel/dp/B0009IRHL8/ref=cm_cr_arp_d_product_top?ie=UTF8 . This monitor is no longer available from Amazon but the site is still there. Newegg also has the specifications for this monitor.
Unfortunately, I can't find the manual for the A17W221. AOC only lists a few manuals for current models. These are available here:
http://www.aocmonitorap.com/my/user_manual.php .
I hope this helps. To check for available stations in your area, use a site like antennaweb.org or tvfool.com. Antennaweb gives very conservative estimates on stations that you should be able to receive with an external antenna.
Cindy Wells
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