A tool available online, although not related to Shopper+/PrimeCables, could be used for this:
This tool will analyze your location to determine which broadcast television signals are available in your area. It will compute the expected signal strength for every channel "in the air" at your location, including adjustments for transmitter power, terrain obstructions, curvature of the Earth, and other factors that affect signal availability. This information can help determine the relative signal strengths of stations that are potentially within reach of your location. It can also come in handy when trying to troubleshoot reception problems.
1. Enter your location information
2. You'll receive results similar to the following diagram
Basically at this point, all the information you need is shown on this graph. Channels in Green are close and strong signals, which means mostly you can receive it with any modern VHF/UHF antenna. Channels in Yellow are within the acceptable reception range, it means that if you are living high, in a tall building or mountain terrain, you will probably be able to pick up the signal by using a small indoor antenna, and it should not cause any trouble for an outdoor antenna at all. Channels in Red and Grey are the most tricky ones, it will normally require a relatively open terrain, low interference (e.g. area not close to an airport), good weather condition, and a powerful outdoor antenna with amplifier to get the signal. But, even if you do reach all the condition above, the reception for those weak signal channels are still not a guaranty.
3. For more information on the graph you've obtained, you can scroll down the page and click to get more details, as shown here: