Final answer:
The angular resolution of a radio telescope can be improved by combining multiple radio dishes into an interferometer array, using the technique of radio interferometry.
Step-by-step explanation:
One way to improve the angular resolution of a radio telescope is to combine a large number of radio dishes into an interferometer array. This technique, known as radio interferometry, links two or more radio telescopes electronically to enhance resolution. Specifically, an interferometer array functions like a multitude of two-dish interferometers, concurrently observing the same part of the sky.
Advanced computer processing is then utilized to reconstruct a high-resolution radio image, significantly improving the angular resolution previously achievable with single radio dishes alone.