A 90 cm antenna is advised for Hawaii. Signal levels drop off rapidly east of the middle of Cuba, resulting in little or no reception in the Caribbean without considering monstrous antennas. Areas to the West and Southwest may find reception requiring 1.2 meter and larger antennas. Lower 48, but a 24 inch model is recommended for most of the United States Lower 48 mainland, increasing to 75 to 90 cm in South Texas near the Rio Grande Valley, and possibly 75 cm in extreme southern Florida. 90 cm to 120 cm antennas can extend the ability to receive this signal several hundred miles into Mexico.
Same sizes allow reception into the north and western Caribbean.
South and East of Puerto Rico, requirements start at 120 cm are larger. Please check locally beyond that point to see what is successfully being used. Within Canada, an elliptical dish is being provided to allow reception of both Anik F1 at 107.3 West, as well as Anik E-2 at 111.1 East. U.S. locations very close to the border may be able to use such an antenna, but the majority of locations will require a larger separate antenna to receive Anik E-2. Lower 48 having a chance at any reception.