Apex domains cannot have CNAME records.
Question and response
Question
dig radiocovataroman.org. NS
Answer
radiocovataroman.org. 4 NS ns-700.awsdns-23.net.
radiocovataroman.org. 4 NS ns-1471.awsdns-55.org.
radiocovataroman.org. 4 NS ns-824.awsdns-39.net.
radiocovataroman.org. 4 NS ns-1923.awsdns-48.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0