1. Use a well tuned and efficient antenna
A low SWR means more signal radiates from the antenna and not reflected back into your transmitter. A high SWR, can damage or shorten the life of your transmitter.

2. Increase height of antenna
You might be surprised what a five foot
increase in height can do to improve your

3. Replace or upgrade RF cable
RG58 has 5.8db loss per 100ft
LM400 has a 1.2db loss per 100ft
Coax Cable Attenuation Chart

Improving Your FM Broadcast Coverage
Radio Brandy
Use high quality cable and connectors
Radio Brandy
Times Microwave LM 400 Cable Attenuation Chart
Proper PL259 Installation