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This antenna is made with a classic hentenna where a reflector has been added
Comparing a 3 elements squeletton antenna, the gain is similar but the front-back ratio is less.
HEN+ Reflector => Formawrd Gain 11.52 dBi   F/B : 12.08 dB
3 el. squeleton antenna => forward gain 11.29 dBi  F/B : 19.46 dB
Mechanica construction is more easy.
The dimensions are those given in the DK7ZB page.
 

Modeling (Mmana-Gal) :

Frequency : 50.100 Mhz
Elements : tube Alu 12mm
 

Segments numbering:

hen antenna with reflector

 

 Computing:

Antenne hen reflecteur calcul

 

Far Fields

 Antenne hen reflecteur far fieldsl

3D Far Fields

Antenne hen reflecteur far fieldsl 3D
 

Dowload the antenna mmana file here

 

Practical construction and assembly:

Material

ON8IM hen antenna with reflector 001ON8IM hen antenna with reflector 002ON8IM hen antenna with reflector 003
 antenne hen reflecteur assembalge 001antenne hen reflecteur assembalge 002