Dont feel embarrased about anything. You had questions and you were calm and collected and resonable.
First of all, unless you have had experience, GRE scanners can be a b*tch to program by software and even harder by hand but you did and you got it right!
As for your antenna, generally the stock antenna that comes with GRE items is good enough for local motorola and EDACS channels and systems in the 800 meg range but poor for fleetnet which is VHF Hi.
I you have extra $ you can invest in a Diamond antenna that is designed for fleetnet and for the 400 MEg band
The first one I used for many years, it is a good deal better than the stock antenna of any RS GRE and Uniden scanners I have owned
SRH-77CA [DIA-SRH77CA] - $35.00 : Radioworld
The second one is tiny, it wont work as well as a Diamond77CA but it might fit your needs. I used it for a week and traded it in
SRH-805 [DIA-SRH805] - $45.00 : Radioworld
Durham has also a good selection of antennas, have a look here:
Ducky Antennas - Durham Radio Sales and Service Canada
You might want to try the following antenna. It is darn good for the buck, short, you can put it on anything metal and stick it near a window and you will be surprised by the results. I use it as my main home antenna.
KS3 - Micro Magnet Mobile Scanner Antenna Canada
I do not want to recomend Durham I would rather deal with Lakeshore Electronics and Radio World for reasons I do not want to publically share. The KS3 antenna at Lakeshore Electronics is a few bucks cheaper and the contacts there will help you recommend better mag mounts or base antennas as well, many of the members here live to help out others and can recommend and be very helpful.
Lakeshore Electronics
Meteor Dr, Etobicoke, Ontario M9W 1A4
(416) 675-2929
Eric