Calculating the total power received by an antenna

[enginej]

A radar antenna transmits 50kW at 10 GHz. Assume transmission is in a narrow beam, 1m^2 in area, and that within the beam, waves are plane waves. The wave is reflected from an aircraft but only 1% of the power propagates i the direction of the antenna. If the airplane is at a distance of 100km,

Calculate: The total power received by the antenna. Assume Permittivity and permeability of free space and conductivity of 10^-7 S/m.

ANSWER: The answer is 0.266 W (I can't seem to get it.)

 

[scottdave]

Can you show what you have attempted, so far? Then we will make suggestions to guide you.

 

[enginej]

Can you show what you have attempted, so far? Then we will make suggestions to guide you.

Thanks for the interest, I already attached the PDF file of my work, let me know if you can't see it.
I also attached a second attempt of the problem, to this post.

 

[scottdave]

I missed that there is a file attached. I will take a look.