The extra codes are handy for not being interrupted by other people as much, however the other person your talking to must have this feature as well. As far as antennas go it depends where you will mount it and what terrain you are travelling through.
In hilly areas use a low gain antenna eg a 2 - 4.5 db
In open country use a 6.5 db
Pretty much these days unless you want to cut extra holes in your roof to mount your antenna, you will need a ground independant antenna.
You will get the best reception if you mount the antenna as high as you can however you need to balance this with getting into a garage etc.
If you mount it on a bulbar it will need a heavy duty barrel spring base.
I use a 30 cm 4.5 db ground independent antenna mounted on the roof rack as it is nice and high but I can still get into carparks. And around Brisbane 4.5 db is good for the hilly areas.


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