Macquarie Radio Network’s $200 million merger with Fairfax Media’s radio business is expected to contribute to an earnings slide of more than 50 per cent at the John Singleton-controlled company. MRN warned investors on Friday that based on unaudited accounts reported earnings before interest, tax, depreciation and amortisation (EBITDA) will have fallen 56 per cent in the six months to December 2014 from the same period in 2013.