You'll actually make very few contacts of 100 miles. The best band for that distance would be 80 meters, and unfortunately, you won't have room for a very good 80 meter antenna. Your best bet is 40 and 20 meters. The average distance of your contacts will be about 500 miles. Of course, you'll make some with close-in stations. But between about 30 and 200 miles, you will have very few, because that approximate distance will be within your "skip zone".