I think the best place to go for mobile operation help and advice is, like Nathaniel mentioned earlier in this post, www.k0bg.com
Are you currently on HF now? If so, I think 14.185kHz is one spot the mobile guys hang out on. You may want to listen in on that frequency (I don't think you can transmit there as a novice or a general), copy some call signs, then email the guys who are into mobile operations and ask for help. Some mobile ops have great signals. How they do it I don't know. I'm into base station operations. Playing radio in the car doesn't appeal to me.