Yes 146 is it, but the impedance should be tuned for 50 ohms. If that gets outta wack you start to get a loss at the antenna/coax connection, long before the signal thinks about getting to the receiver. I had to go to my local radioshack and get a CB antenna and cut it to the correct length for 126.55. I had to cut the whip to 4' 7 1/2" which is a 5/8 wave antenna
, and now i can hear the tower clearer than i have ever heard it before from my house.
Here is a shot of the temporary antenna i had to come up with. It is a magnet mount base with a 4' 7.5" whip mounted on a pizza pan. The pizza pan acts as a ground plane, just like if it was used on a car. If you ever needed to use a mag mount antenna, thats a little secret for you, Stick it to a pizza pan atleast 12" round.