Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Air Traffic Control Developmental
Confusion; Situational Awareness; Troubleshooting; Distraction
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance
ATC Equipment / Nav Facility / Buildings
Aircraft X was a VFR aircraft routed via SKY direct CYYZ at 3;000.  In the vicinity of SKY radar contact was lost.  I was able to re-establish radar contact intermittently through position reports and a primary radar target that periodically displayed on my radar scope.  Communications were maintained and I was able to give traffic advisories based on pilot reported position.The Radar at CLE has been experiencing problems for over a year.  Since the most recent 'fix' we have experienced targets dropping and reacquiring in the SKY basin area as well as in other areas closer to CLE. Mode C readouts have also been intermittent for small aircraft; especially if they are 30 or more miles away from the CLE ASR9.  I recommend that more attention is given to this radar issue to prevent a serious incident from occurring.
CLE TRACON Controller reports of a blind area related to the CLE ASR-9 radar with aircraft that are low over the SKY airport.