OurAirports has records for 4 different navaids with the identifier "MAC". Please select the one you'd like to view.
Brazil
240 KHz (MAC -- .- -.-.)
-- .- -.-.
112.70 MHz (MAC -- .- -.-.)
Ecuador
285 KHz (MAC -- .- -.-.)
United Kingdom
116.00 MHz (MAC -- .- -.-.)