The best quality Band expander for Australian Market is 18 MHz unit! (Don't buy 10 or 20 MHz Apro units, they have often a cross over interference problem and static FM reception + you might lose AM signal by installing one of these units!
This is the one to buy:
http://bandexpanders.comze.com/1_2_Products.html
The Aerpro from any Autobarn is chinese made unit with very, very poor performance! So, if you don't wish to have lots of static on radio reception, buy this one:
http://bandexpanders.comze.com/1_2_Products.html