Hand made directional antenna UDA-Yagi 9elements, excellent tuned for 868MHz or 915MHz. 
Every my antenna tuned individually, it has photo with own chart VSWR and own serial number. You can see really VSWR and resonant frequency by marker on chart.
Technical characteristics of the antenna:
 
 
Polarization
linear
 
Resonant frequency, MHz
868 or 915
 
Gain, dBi
13,3
 
VSWR, not more
1,2
 
Impedance, Ohm
50
 
Input power, W
10
 
Jack
SMA male(can change by your request)
 
Cable Length, cm
40
 
Weight, g
350
 
Operating temperature, deg. Celsius
-40 ÷ +50