M.Sc

Well as MS is an specialisation course and you will be getting converged in your stream. So, you must choose it wisely. First of all, think as what in electronics or communication makes you mesmerized, it can be however both. In electronics it can be analog electronics, digital electronics, microprocessors, embedded systems, control systems, VLSI technology, anything. And in communication it can be Analog communication, digital communication, antenna and wave propagation, radar communication, wireless technology, satellite communication, anything. So first of all choose yourself the subject in which you feel interested, find yourself research oriented and confident enough to tackle its complexities. However as per my opinion VLSI technology is a good option for MS while the final decision will totally depends upon you and your interest as there isn't any course which is best, its you who will perform in the respective course making it the best course for you.

You could try Indian Institute of Astrophysics, Bengaluru. It is one of the oldest institutions in India (1786 AD) and right now, the premier institute for Astrophysics (in my opinion). They offer three courses:
M.Tech, Ph.D. Dual degree GATE written test)
M.Sc, Ph.D. Dual degree JEST written test)
PhD. Currently they operate out of their campus in Koramangala, Bengaluru, though the CREST campus - Hosakote, Kodaikanal Solar Observatory, Vainu Bappu Observatory, the Gauribidanur radio telescope and the Handle Observatory are under them. For more information visit Indian Institute of Astrophysics
2. You could also try IUCAA (Inter University Center for Astronomy and Astrophysics), Pune. Visit IUCAA (qualifying exam: JEST)
3. If you are interested in theoretical Sciences, You could try TIFR (Tata Institute of Fundamental Research) or JNCASR (Jawaharlal Nehru Centre for Advanced Scientific Research) or RRI (Raman Research Institute) (qualifying exam: JEST or GATE)
4. IISc (Indian Institute of Science, Bangalore) provides courses related to astronomy. The advantage is the beautiful campus of the best Institute of India. GATE or JEST or written test)
5. Not really Astronomy, but Indian Institute of Space Science and Technology (Home : IIST) runs courses in Engineering related to Aerospace and Avionics. In-so-far as job opportunities are concerned, Research and teaching would be primary. For example, the Handle telescope in Leh is controlled through CREST, Hosakote. So that's a more technical job. IIST, however is quite different from the rest. It is a company (ISRO) backed institute and the placement might be different. The institute is possibly the most beautiful one you will see.