The antenna required and the location of it will depend on your expectations. The rubber duck antenna is not your best option and inside the car is not a very good location. They could both work well though if you only need to receive 800MHz in a metro area.
What are trying to monitor and what are the surroundings like?
Why don't you try it with the rubber duck and see how it works? Only you can find out how it works in your car in your area and only you can decide if you want to buy and install an external antenna.I have a handheld analog scanner and I was wondering if I can listen to it in my car using the "rubber duck" antenna it came with or if I need to purchase an external antenna.
sounds like you get pulled over way too much there. I'm 51 and haven't gotten pulled over here for 26 years and have always had a scanner in my vehicles. But your point is well-taken.This is true but I have been stopped several times here at check points and also random stops where they have noticed the scanner mobile in the car. and was told that if it was a hand held with the rubber duck they would not have bothered me. In Florida it is a $500.00 ticket for having it in your car. You never know what a cop is going to do. I have been to some states where they did not care that I had a ham ticket. Remember there are a lot of Barney Fifes out there
Yeah and there are some uptight cops around here too. Hell I even had a Bearcat 10-crystal scanner in my GTO when I was 18 and when I got pulled over in Pacifica by a cop, the 1st thing he asked me was "what's with the scanner?" I told him I love listening to you guys I have one at home too and I'm into radios. He actually smiled and cut me loose with a warning (I opened her up at the beginning of the 55mph zone right where he sat-he could've gotten me for exhibition)Hard to find many good things to say about California these days, but at least we aren't hassled for mobile scanners.
the best advice is the most practicalWhy don't you try it with the rubber duck and see how it works? Only you can find out how it works in your car in your area and only you can decide if you want to buy and install an external antenna.