1941 Packard Radio/Antenna Question

Posted by Ragtime Kid On 2021/9/26 13:50:53

1941 Packard 110 with original Motorola radio. Radio was recently restored and works perfectly. Not wanting to add any visible external antenna and, without it, the only sound I get are a couple of faint AM stations mostly drowned out by the "audio tachometer" that the radio has become without an antenna. All you hear is the ignition noise amplified.

Is there a way to plug an iphone into the AM antenna jack and just stream music through the Motorola radio? Electrical system is original 6V positive ground so want to avoid anything requiring a power hookup. Do I need to be concerned about "impedance" or anything else if there is a jack that adapts the iphone phono plug to the AM antenna jack on the radio?