by winegard » Tue Oct 12, 2010 10:21 am
The reason antennas are made for specific ranges is to maximize the gain (or signal strength) on the desired channels. An antenna's peak performance is in the middle of it's channel range and the smaller the channel range the higher of a peak it has.
Think of it as a curve...
The further you stretch that curve the shorter the peak becomes. In your case an antenna that picks up lo-VHF will move the peak to the left while also shortening the peak, giving you less gain on the higher UHF frequencies that you need.
That is kind of a general way to look at it and there are a lot of factors involved, but I hope this explains that part of it. This is also why you see antennas made in the USA, such as ours, maximized for channels 2-51 compared to antennas manufactured overseas and imported which range to channel 69 which is not needed.