Where can I find a replacement antenna for my Aiwa CA-DW700M?

The moving company snapped the antenna on my portable boom box and I can find an equivalent one locally. The user's manual doesn't have replacement part numbers. I've tried Aiwa's site, but it wants a part number. How can I find out what the part number is, or who might have one? It's not a standard antenna. I bought one of those and it doesn't work.