Replacement antennae for 94 325ic

My antennae and base have broken and I need to replace it. However, I found that the one that's specified for my car (Base: 65 21 8 375 159 Mast: 65 21 8 375 160) is about $130 mail order.

Seems a little steep to me. Any suggestions on an alternative or problems using something else might cause?