At 30 miles, the higher you install your antenna, the better chance you'll have with receiving
DTV signals. Is there any kind of obstruction (hill, tree, etc.) by your house? UHF signals have a tougher time going around such obstructions, unlike VHF signals.
That Philips US2 MANT510 is ideal for signal reception approximately 20 miles or less from broadcast towers (results may vary). As Cowboy mentioned, antenna placement in the attic will reduce reception, but at your distance, you might be able to get away with it.