Exploration Array design

Hello,

I have to design an exploration (scanning) array antenna with 7 dipoles and Dolph-Chebyshev feeding. The width of the main lobe has to be minimum.

I have some doubts about how the visible margin is with this sort of feeding. I have to calculate the distance between dipoles. If someone could help me with this design I would appreciate.

Thank you in advance.

Regards,

ángel.