Ova antena je dizajnirana i napravljena 2004. godine za potrebe 4N1SM koji je nakon dobrih razultata sa jednom antenom napravio još jednu i stakirao ih na stubu od 19.5m – donja antenna je bila postavljena na 8.5m za optimalno pojačanje celog sistema. 

Sistem je koncipiran tako da se može raditi sa tri varijante: 

1. Obe antene
2. Samo gornja antenna
3. Samo donja antenna

što je omogućilo izvanrednu fleksibilnost u izboru najpovoljnijeg take-off ugla u zavisnosti od propagacija i željene destinacije. Prikazani dijagram zračernja je za jednu antenu postavljenu na 20m iznad zemlje. 

Tokom 2006 ista ova antenna je redizajnirana sa drugačijim setom cevi za OM Samira 7S7V – karakteristike antene su ostale potpuno iste kao i originalni dizajn.  

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This antenna was initially designed in 2004. for 4N1SM – Simo. After some time he has built another same antenna and stacked them in a 4 over 4 system with top antenna at 19.5m and lower antenna at 8.5m for optimum gain. 

System was able to operate in three ways: 

1. Both antennas
2. Only upper antenna
3. Only lower antenna

and that has given him very good flexibility to select optimum take-off depending on conditions and chosen destination. Presented radiation pattern is for antenna placed at 20m above the ground. 

During 2006 this same antenna was redesigned for OM Samir 7S7V (SM7VZX) with different set of taper elements but keeping all specifications identical to original design.  

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FREE SPACE GAIN       9.27 dBi       ( 7.13 dBd )

 GAIN AND PATTERN IF ANTENNA IS AT 20m A.G.

YU7AOP comparison signal measuring between  TH6DX to EF154A1