You can search Google for 'digital antenna' and get many hits.
You present antenna is good for VHF and UHF (VHF 2-13, and UHF 14-83) At present, digital signals are being broadcast in the UHF range because there apparently are more available channels in that frequency range. After all is said and done, and analog is o longer broadcast in the VHF range, they may switch back to the VHF frequency as the line of sight and over the horizon strength is better at the lower frequencies.
So, for present, all you should need is a good UHF antenna to get good digital signals. I would not spend to much money on an antenna until everything settles down in the digital world.
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