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(incase anyone is having trouble you can not program a channel if it is transmitting, remove antenna)
If its transmitting it would be unwise to remove the antenna as it could burn up your finals. I hope you mean it was receiving a signal from something.
Its possible you have tone squelch enabled. Make sure you have it set to none unless you are getting interference from something else on the same frequency farther away. Then you will have to change the tone listed.
Marion County, Indiana (IN) Scanner Frequencies and Radio Frequency Reference
I ordered a kit from Keith Mandoske as I have done several Raptor Runs with him and he uses radios alot at his job. His kit had everything and is Raptor specific.
He told me which antenna to buy, other than that you just need tools and the will to cut your truck.
I like the face plate in the ceiling and was okay with drilling my roof for an antennae because of doing Runs often, but if you are not comfortable with that he has other solutions that are easier to install (just not as elegant imho).
He is a Snoball lead so is in Michigan now, but PM him and he will set you up!