BuzzerBeater Forums

(...)
Jump Range is the range his jumpshop will maintain his effectiveness while backing further away from the board...

Example:
Player 1 with JS - Respectable and jump range atrocious.
His jumpshot is Respectable only when he's very close to the basket. If he goes any further his jumpshot will not maintain the respectable status, and it will decline rapidly. By mid-range his Jumpshot might be pitifull.

Player 2 with JS - Respectable and jump range mediocre.
His Jumpshot will maintain the same skill further than player one. While player one has his Jumpshot declined to mediocre by stepping further away from the basket, player 2 might has his jumpshot still maintained at respectable.

Player 3 with JS - Average and jump range strong.
This player can maintain his Average Jumpshot even if he's positioned near or behind the 3 point line, while player 1 might has his jumpshot reduced to atrocious by that time, and player 2 to mediocre.

(...)
So basicly, jumprange is just a measure to determine the decline of the players Jumpshot skill due to range.