Radia Telescope at Arecibo, Puerto Rico?

[tophops34]

The radio telescope at Arecibo, Puerto Rico, has a reflecting spherical bowl of 290 m diameter. Radio signals can be received and emitted at various frequencies with appropriate antennae at the focal point of the reflecting bowl. At a frequency of 300 MHz, what is the angle between two stars that can barely be resolved?

[Nev]

Rayleigh's criterion, sin (theta) = 1.22 Lambda/D

where theta = what you are looking for,
lambda = wavelength = speed of light/freq
D = 290 m

My answer: theta = 0.24 degree - pretty small angular separation!