Final answer:
The edge of scope separation for an aircraft that is more than 40 miles away from the antenna site is known as Far Edge of Scope Separation. This term is specific to aviation and refers to the separation standards applied on radar displays for aircraft at greater distances from the antenna.
Step-by-step explanation:
The term you are asking about relates to air traffic control and radar systems, which is part of aviation, a field within engineering. When discussing the separation on radar scopes in air traffic control, especially concerning aircraft more than 40 miles away from the antenna site, the correct term is Far Edge of Scope Separation. This refers to a separation standard applied to aircraft that are depicted on the outer edges of a radar display. The separation minima might differ in this area compared to the near field due to limitations like radar resolution and potential inaccuracies in position reporting as distance from the antenna increases.