1, Electrical Characteristics 
i) Resonate Frequency :     186±10 MHz  
ii) Impedance : 50 ohm Nominal 
iii) Radiation Pattern : Omni Directional 
iv) Polarization :  Vertical 
v) Standing Wave Ratio (S.W.R):   2.0 or less  at Resonate point  
vi) Insulation resistance  :   500 M ohm at DC 500V 

2, Mechanical characteristics: 
The strength of fixing between sleeve and stud shall withstand the following stresses 
Vertical Direction:  2.0   kgs

Rotating Direction:  2.0   kgcm   

ii)  180° sway strength shall be     1.5kgcm to 4.0 kgcm       

iii)  360° torsional  shall be        0.5kgcm to 6.0 kgcm