Nice choice of AM CB radio. I will never understand why you guys like these RFX chasis mount amp's and RM203 stinger boards. Packaging, mounting, repair options are always better with a amp that is separate from the radio. Just my opinion mind you but I think you should always have 100w RMS available with any amp you add to a CB radio. Unlike bipolars of old non-rf mosfets in rf use are not very durable and can not tolerate much mismatch at any phase angle. They also have very low gain. I did the chaisis mount RF amp in the 1990's in high school and college but not with mosfets. Also vehicle mounting was far easier. When the RFX fails and it will fail you will need to send your entire radio out for repair instead of just the amp.