The IC910 is designed to work best with a mast mounted pre-amp... I use it with an SSB electronics amp. With my IC910 and SSB amp, if I couldn't hear it... It wasn't there ;-) -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.6/428 - Release Date: 2006-08-25