Just so you don't have to spend more money on a new repeater after a few thunderstorms, a lightning arrestor is a must. A polyphaser is the arrestor of choice on our systems. The old feedline could be the problem as far as your coverage problems go.
Some things to help determine what you problem might be are:
Is there any desense between your TX and RX?
What kind of antenna are you using?
Terrain issue maybe?
Also I would see about measuring the power out of the coax at the antenna end and do a quick calculation on what your losses are. For a VHF repeater, 1/2" Andrews Heliax is a pretty good choice for VHF for the $$.
Andy
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