I have no idea as to what a Wilson mobile antenna is but I'd bet its very inefficient and the issue is probably your power and antenna.
Almost every week I talk thru the KQ2H, 29.62MHZ FM, repeater in New York, a North Carolina repeater on 29.67 and several remote base systems on 29.6 FM one in in Montgomery Texas and another in North Carolina plus Brazil, Mexico, Argentina, Panama, Puerto Rico all on 29.6 FM and Japan and Korea on 29.28 and 29.3 FM.
I am only using a 60 watt Motorola Maxtrac mobile setup as a remote base into a home brew moxon antenna at 20 feet.
When I'm out mobile and not near my houses remote base system then I use a Maxrad 68 inch mobile whip and a 110 watt General Electric Orion mobile radio.
E season is coming up real fast in the next week or two and it should last into mid Augusts so 29.6FM, 29.3FM and 29.28FM along with the repeaters will be very active.