This is an image of your TVFool report:
This is a report from rabbitears.info which should have a more accurate list of channels:
To answer you initial question, if your antenna is mounted outside, a preamp and your TV tuner would be overloaded by your strongest signals. If your antenna is in your attic, the signals will be weaker, but it is difficult to predict how much weaker they will be because of differences in construction. Try it first without a preamp.