For this project aboard a Monterey 320SY cruiser, we chose the Intellian i3 satellite TV system ($2,799.99). The dome measures 167/8 inches wide by 75/16 inches high and weighs about 20 pounds. For smaller boats, consider the Intellian i2 ($2,199.99) or TracVision M1 ($2,289.99) — both are lighter and more compact than the i3. However, satellite TV signals are aimed at land, so the smaller the antenna, the less likely it will pick up a signal when venturing offshore. Bigger is better for blue-water boaters.