I live between Baltimore and DC and I use a UHF antenna to get local HD/digital channels from the DC area. Is there a better UHF Antenna product available that is more powerful or can pick up a broader range of signals? I would like to pick up all the channels that are available in the area. If not, could I add another UHF Antenna pointed at Baltimore, split it on the rooftop, and run through the same cable? Any help is appreciated.

You could try a multidirectional antenna. But these tend to have limited range. You could also combine 2 antennas no problem, although I'd recommend more than your average $1.50 splitter for this.

To answer whether your antenna could be more powerful, you would need to list the type/model if possible. A good resource for researching what you need is antennaweb.org.

Im not from the east coast, In in Phx, but Ive put up several antenna's. Get a good 30 mile RCA antenna, use a single RG6 down and you just need to get a happy medium, I have never had any luck combining antenna signal. But if you have any luck let me know. I'd try some high power signal combiner if you do. Another problem as I see it, is if the stations from other states you can get are broadcast on the same frequency. Your might get some crosstalk. Good Luck

illcrx's answer is the right one, using different antennas for different channels. He can't combine the signal because each antenna with a great signal on its chosen signal will add lousy signals on the other channels when you mix them together with a splitter.

The thing to look for is a Pico-Macom or Qintar MX-4U combiner. It consists of four tunable bandpass filters used to combine antenna signals and filter out the signals you don't want on each input.

I was also just looking at channelmaster.com and see that they have single channel filters just made for combining signals from different antennas, unless the signals are on adjacent channels (a normal limitation).