I tried to use a small power invertor to power my AM/FM radio in my work truck as no radio is provided and wanted to avoid batteries. FM works great but AM is only noise. Even tried my Bose Wave Radio with the same result. Would an invertor that says "modified sinewave output" give me a different result? I have had several AC/DC radios over the years but there aren't many available anymore and the quality is pour i.e.. Radioshack. Thanks for any help.