OurAirports has records for 5 different navaids with the identifier "MRB". Please select the one you'd like to view.
Australia
218 KHz (MRB -- .-. -...)
-- .-. -...
Brazil
370 KHz (MRB -- .-. -...)
113.70 MHz (MRB -- .-. -...)
United States
112.10 MHz (MRB -- .-. -...)
Yemen
271 KHz (MRB -- .-. -...)