Lifelight uses 155.160 118.8 and Lifestar uses 155.385 123.0 Not sure about Lifestar, but I know for sure Lifeflight often receives interference and the bird often gets walked on while transmitting. I can only imagine this inteference is from Trinity as Lifeflight is at the top of Mount Wachusett and their transmitter rangest as far as Portland ME from my experience.
Just seems rather odd that they would have the same frequencies assigned considering both are regional.