Bad reception means (to most people anyway) that radio stations won't "come in".
Radio interference (to most people anyway) means that there is noise in the radio like buzzing from the alternator or distributor. That is what the Corvette ignition shielding was made to controll; interference.
In fact, besides the pictures posted above of the shielding kit, there were 2 "V" shaped shields mounted to the engine block to cover the 2 forwardmost sparkplug wires where they ran to the plugs. Thats how important all that shielding was to stop the ignition noise in the radio. It was not for reception.
