What is the range of the Motorola walkie talkies? T 4500 and the T6550?
Height and placement of the antenna determines range.
Typically speaking a handheld radio will get up to 2 miles line-of-sight. If you are talking in and around concrete, brick, metal, or in-and-out of a building you could expect only 1/4 to 1/2 mi. Conversely, if you were on top of a mountain and you could see 25 miles into the valley, you could talk as far as you could see with no obstruction.
All this being said, there are some things you can do to make certain you get the best range out of your radios. First, always hold the radio upright with the antenna perpendicular to to the ground (straight up). Tilting your radio to the side can reduce your range by as much as 2/3s. Second, face the direction you are talking. Lastly, wear the radio higher on your body with the antenna upright. Height and placement determines range. (Keep in mind, even your body fluid will absorb part of the range.)