Motorola NAF5084, NAF5084A flexible whip dual band 700/800 MHz quarterwave stubby radio antenna. This is the same as 8505241U15.
Flexible whip antennas have a one-piece finish and steel core for optimal radiation characteristics. Provides more comfort when radio is worn on the belt.
700-870 MHz
Length is about 3 inches, Usually called the short "stubby" antenna