Radio transmitters on earth, e.g., television, bands like AM and FM, military channels, etc,
produce a myriad of radio signals covering nearly all the radio spectrum. A radio astronomer
has the constant challenge of finding location, where transmissions are at a minimum, e.g.
away from cities, or finding a frequency band, where there are no terrestrial signals.
Nevertheless, there are certain protected frequencies specifically set aside for the use of
radio astronomers, one such being the 
wavelength band.
In the next section we give the protected bands which are relevant to GMRT.