I bought myself a new Vertex 300 (Yaesu

) radio.
It works a charm

now everyone can hear me again
Just one thing

when I drove around with it during the first few days in the car, listening to everyone

I had to put the sq control on "2" otherwise the signal kept on cutting out. But Sat. flying with it the first time I eventually had it on "8" but I kept on getting feed on 125,8 for long periods at a time
It was like somebody in FAVV had a stuck PTT button
This can drive one up the wall
Any advise

or was this only on Sat.
PS. Where can one buy a whip aerial (the one on the plane is 500mm long and I want a 555mm one

)