I have a CD with Radio in my glove box, with the antennae mounted from front to rear along the top of the passenger foot well. My speakers are in separate enclosures on my back deck. No holes anywhere. It works best with a CD, but the radio is fine, if the signal is strong.
Cheers,
Mark
1934 SS MX4 1938 Series 1 DHC 1951 Plus 4 2005 Roadster