How do I get SD TV channels on my HDTV located in Bronx, New York?

Solution
Your question suggests that you are already getting HD channels. I don't think there are any SD channels in the New York area any more but if your TV has an NTSC and ATSC tuner then it should look for both HD and SD when you run an over the air scan for channels.

skit75

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Over the air digital antenna most likely. They have indoor ones that are very directional, unfortunately(Line of Sight). So if you are in a building with only one direction to point the antenna, you could be in trouble.

I've used this site to get mine going and it worked well enough. http://www.channelmaster.com/Antenna-Selection-a/134.htm

You can enter your Zip code and it will show you the nearest broadcast antennae and their direction relative to where you are. This will give you an idea of where you would need to point your antenna to get certain channels.
 

skit75

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Also just wanted to add that there are everyday normal gadgets in your house that will certainly interfere with the signal it can receive. In my experience alone, I found a few digital picture frames that completely disrupt the reception. I can't have them powered on at the same time otherwise the channels all drop due to cross-over frequency interference... but only when I enable the inline antenna amplifier.