1, Electrical Characteristics 
i) Resonate Frequency : 60~80 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  
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)  90° sway strength shall be     0.2kgcm to 3.0 kgcm     

iii)  300° torsional  shall be        0.2kgcm to 3.0 kgcm

3, Others: 
Any modification of this specification has to be agreed by us