@ludapecurka123, no, thats not this radar's fault, in fact, almost everything in TPT reflects 100% of the light, and does not scatter it, like everything here is a perfect mirror, which cannot exist. And real-life things, even if rotated, still scatter some light upon reflection so you can still see them.
So when they reflect off an object (like a plane) the rays that get to the dish are focused onto the bulb at the center (because its ont its focal point), and thats how it sees something. Also, a stationary radar cant see multiple objects, like you did here, thats why its inaccruate, its almost impossible to do reliably. For you to see a "image" you need to move your radar up and down and scan continuously.
So yeah, the dish is a special shape made to focus incoming parallel rays, that are transmitted from the focal point of the dish, exactly there should be the "bulb" you have at the center, and actually it shoots photons radially, at the dish, but because of its shape they reflect in a certain way that they become parallel.
Guys, let me tell some things. @cjun0416 Its good but the dish itself is not for accepting the information, its for focusing the "rays" (neut is unreliable when it comes to travelling with predictable speed, which is exactly what radars are used for, they see something, and for the time it takes from the shooting of the photons (they are better) until they come back, they calculate what was the distance between the radar and the object.).
Good, but not so perfect, look here ID:2306238