Need help with sending...

Hello, I have a new Galaxy cb that I bought while I was active duty in Georgia, now I am reserve and have mounted the unit, but don't seem to be able to send as far as I receive. I have a small 100w amp wired in as well. I can't recall the name of the antenna, but it is mounted on top of my truck, it has a magnet, and the antenna unscrews from it. The antenna itself is maybe three feet tall, and the diameter is just about the same as a regular car antenna, it also has a spring built into the base of the antenna. From research, there is no shops around me to get help from. I will be more than willing to post all info that you ask for, just not sure other than model numbers of unit and amp to post.

Or, should I swap over to HAM?
Thanks in advance......

 

I will post pictures later, for now I will do my best to answer questions,
1) When I bought it, the owner of the "tweaked" the radio for me.
2) When I took it back to get it looked at, when connected to his shop antenna, it had great range.
3) The SWR is sect correctly. I had the shop owner mark the radio where all the dials should be. When I key the mic, the meter is right on. (I am new to this so I tried to set myself up for success as much as I could)
4) If it the antenna (which is what I am leaning toward as well) which do you recommend? Remember, this is a daily driver, I do not want a permanent mount. I would like to stay magnet, one that unscrews from the magnet, and is flexible with a spring at the base like the one I have.

I know the wants are a lot to ask, and there may not be a well made antenna that fits my list, but let me know which one out there will be the best for my situation. Thanks for the replies....

 

Here are the parts of the complete unit...
As you can see on the radio and amp, the shop marked where to put the settings on the radio (silver dots), and which switch to throw on the amp (middle one).

 

Not real sure honestly on the range I am sending. The SWR readings are as follows; Ch1 1.5- Ch40 1.4. My antenna is a total of 42" from the bottom of the mag base to the top of my antenna. It's located right in the middle of the top of my truck. The current antenna does hit the trees and such, any more may be quite the issue.There are no local shops near me that I could find on line. I am very near to Pontiac, Michigan if anyone knows of one...

 

Here is a link to what I think I have, just can't swear to it...
http://www.ebay.com/itm/HUSTLER-IC1...928?pt=LH_DefaultDomain_0&hash=item1c447d4a08

 

The reason I say I am not getting out is because I very rarely get any replies to my "radio checks". Other than having someone else that I know have a radio, and doing a distance check, I'm kinda stumped...
This unit is on a full size truck, as you can see from the pictures, it's just about right in the middle of the roof. Not saying you are wrong, but why away from the sunroof? What is the issue having it there? I only ask for future information.
As I said before, my set up in the place of business from where I bought it picked up close to thirty miles away, but I am unsure what antenna he was using, I would guess a pretty big one, seeing how it is a place of business.
Thanks for the link, I will check it out, and please keep the info coming in, it is very useful.