Telecom regulator Trai is likely to come up with recommendation on spectrum auction by mid of April, Chairman J S Sarma said on Wednesday. "It should be out in the fortnight of April," Sarma told reporters on sidelines of Convergence India 2012 in response to expected timeline for recommendation on spectrum auction. The recommendation is expected to give guidance on key issues like base price of spectrum, amount of spectrum that should be allocated to a bidder and eligible participants, among others.