• Type: Folded dipole antenna 
• Frequency: 430-440 MHz
• Length: 60cm
• Gain: 2.15dBi
• VSWR: 1.5:1 or better  
• Power: 200 Watts 
• Weight: 400g
• Connection: N-Type socket 

The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable "gain" and this is concentrated almost parallel to ground toward the horizon rather than skyward making it more efficient than a ground plane type antenna by about 50 percent better.