Apex domains cannot have CNAME records.
Question and response
Question
dig wideopenwest.com. NS
Answer
wideopenwest.com. 5 NS ns-2003.awsdns-58.co.uk.
wideopenwest.com. 5 NS ns-1519.awsdns-61.org.
wideopenwest.com. 5 NS ns-400.awsdns-50.com.
wideopenwest.com. 5 NS ns-669.awsdns-19.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0