4 holes are just mounting holes, the bigger one in the middle is for BNC (TNC, N or any other) RF connector, and as this connector is mounted directly to the square plate ground is already connected there.1- What are the 5 circles found in the plan view (they take a cross shape).??
2- Where to solder the coaxial cable terminals.???
3- The square plate is 1meter X 1meter. Right.???
This centre pin is your +, - will be connected through the shell of RF connector the the square plate and through it to all 4 radials.The vertical element and radials can be made of brass welding rod (Θ≈3-5mm),
and the vertical element can be soldered directly to the center pin of a coax connector .. choice of a coax connector depends on the availability at your local stores ..
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