IN THE COMPANY OF GIANTS

''In the middle of this decade, the comfortable world of Latin America n network television has been turned on its head, and nowhere more so than in Brazil,'' a correspondent from Rio de Janeiro suggests. ''Grin go capital, long a cultural taboo and often barred outright by nationa l constitutions, is being openly and eagerly courted from the Rio Gran de to Patagonia. Suddenly Latin America is a bowl full of angelfish, a nd the local species will have to swim hard or risk being swallowed.''