HDTV tuner Does this TV have the HDTV tuner integrated or do we have to purchase a receiver/decoder?

Depending largely on the age of the TV, the location of the TV tuner varies. An older analog TV tapping a digital signal does so with an external DTV converter box. For cable and satellite subscribers, there is a a set top box. Most TVs purchased after March 2007 have built-in digital tuners. Look on the front and back of the TV for a marking that indicates a digital tuner. It may say ATSC, DTV, HDTV, Digital Ready, HD Ready, Digital Tuner, Digital Receiver, Digital Tuner Built-in or Integrated Digital Tuner. Any of these is an indication that the TV has a built-in digital tuner. You may have to go to the manufacturer's site to determine such specifications. If you are having a problem with a tv switching channels, remedies may be rather specific and you might try googling for a specific model while including the problem in a simple phrase.

The iLo IWT3206 TV provides two built-in -- or integrated -- TV tuners: a National Television System Committee (NTSC) tuner and an Advanced Television Systems Committee (ATSC) tuner.
While the NTSC tuner allows iLo IWT3206-viewers to receive analog, free-to-air TV broadcasts, the ATSC tuner allows viewers to receive digital TV broadcasts via a cable or satellite provider.
The benefit of having an integrated ATSC tuner is that it negates the need for a separate cable box or satellite receiver, which can take up space.

Your Hitachi 51UWX20B is an HDTV-Ready TV. No Digital Tuner. HDTV-Ready means that your TV set is capable of displaying analog and high-definition digital pictures, but without a digital tuner, it cannot receive the digital signal. An HDTV-Ready requires an external high-definition TV receiver (digital tuner) in order to receive HDTV signals. These external receivers can be called an HDTV Tuner, set-top-box, decoder or DTV Converter Box . So you will be required to purchase a converter box to receive over the air programming from an external antenna.

Sorry to say, your HDTV-Ready - Requires separate receiver to view HDTV signals. SDTV (Standard Definition) - has built-in digital receivers/decoders and do not require the purchase of any separate components in order to display digital signals. It provides lower image quality than EDTV or HDTV, but higher image quality than analog TV. SDTV is displayed using an aspect ratio of 4:3. I hope this helps and good luck.
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This LCD is HDTV capable with integrated ATSC tuner. It can receive OTA digital channels.

Yes this TV should tune to both Digital & Analogue reception. See below I have copied an extract from the Philips technical site which gives you verification that this has digital capability. Hop this is of help to you. Next to analog NTSC broadcast reception, your TV has an integrated High
Definition TV tuner which receives, decodes and displays terrestrial ATSC and
unscrambled cable (QAM) signals.
HDTV quality is only reproduced when a broadcaster or cable provider broadcasts
HDTV signals.

Direct from the Hitachi website - "Integrated HDTV Tuners: Hitachi's new top-of-the-line XWX series features built-in ATSC terrestrial and cable HDTV tuners to provide integrated high resolution, high-definition signal decoding." You will need a seperate HDTV tuner if you do not have cable or satellite and want to watch off-air High Definition channels.

According to http://www.dtv.gov/consumercorner.html#faq9

How can I be sure that I am buying a digital TV (DTV)?
By law, beginning March 1, 2007, all television reception devices (including TVs, VCRs, DVRs, etc.) imported into the U.S. or shipped in interstate commerce must contain a digital tuner. Retailers may continue to sell analog-only devices from existing inventory, but must prominently display on or near the analog-only device a Consumer Alert label with this advisory:

What is the difference between “Integrated” DTVs and DTV or HDTV “Monitors”?
An Integrated DTV set is a television with a built-in digital tuner (also referred to as “a DTV”). A digital tuner is also sometimes called a DTV decoder or DTV receiver. If you have an Integrated DTV, you will not need any additional equipment, with the exception of a broadcast antenna (either a rooftop antenna or “rabbit ears” connected to the set), to receive over-the-air digital broadcast programming. Integrated DTVs can also receive and display analog broadcast programming, so you can continue watching analog broadcasts.
In contrast, a DTV Monitor is not capable of receiving digital broadcast programming without additional equipment; it is simply a display device without the processing capability for DTV reception. A digital or HD set-top box must be connected between the antenna and the monitor to receive and display over-the-air digital or HD programming.
If you have a digital or HD “Monitor” and would like to purchase a digital or HD set-top box to view over-the-air programming, confirm with your retailer that the set-top box is compatible with your Monitor.

According to http://www.dtv.gov/consumercorner.html#faq9

I hope this soultion is helpful.

How can I be sure that I am buying a digital TV (DTV)?
By law, beginning March 1, 2007, all television reception devices (including TVs, VCRs, DVRs, etc.) imported into the U.S. or shipped in interstate commerce must contain a digital tuner. Retailers may continue to sell analog-only devices from existing inventory, but must prominently display on or near the analog-only device a Consumer Alert label with this advisory:

What is the difference between “Integrated” DTVs and DTV or HDTV “Monitors”?
An Integrated DTV set is a television with a built-in digital tuner (also referred to as “a DTV”). A digital tuner is also sometimes called a DTV decoder or DTV receiver. If you have an Integrated DTV, you will not need any additional equipment, with the exception of a broadcast antenna (either a rooftop antenna or “rabbit ears” connected to the set), to receive over-the-air digital broadcast programming. Integrated DTVs can also receive and display analog broadcast programming, so you can continue watching analog broadcasts.
In contrast, a DTV Monitor is not capable of receiving digital broadcast programming without additional equipment; it is simply a display device without the processing capability for DTV reception. A digital or HD set-top box must be connected between the antenna and the monitor to receive and display over-the-air digital or HD programming.
If you have a digital or HD “Monitor” and would like to purchase a digital or HD set-top box to view over-the-air programming, confirm with your retailer that the set-top box is compatible with your Monitor.

if there is a label on the tv stating any of these words “Integrated Digital Tuner,” “Digital Tuner Built-In,” “Digital Receiver,” or “Digital Tuner,” “DTV,” “ATSC,” or “HDTV” then yes
if they say “Digital Monitor” or “HDTV Monitor,” or as “Digital Ready” or “HDTV Ready" then no