OK, thanks for the photos, that helps a lot.
Those are VHF low band radios, good from 42MHz to 50MHz.
FCC licensing is complex and confusing for the newcomer.
You have two options for licensing these radios:
1. Itinerant licensing. This is a license that lets you use these radios at "unspecified" locations. You won't be able to license for a fixed location. Usually not a big deal. You also will be limited to only one available frequency that these radios will cover, 43.040MHz. Itinerant frequencies are shared, and you will have to cooperate/share with other users. It will not be, and will never be "your frequency".
2. Coordinated frequency or frequencies. This will require working with an FCC approved frequency coordinator. That frequency coordinator will look at your needs and determine what frequencies are available and will best suit your needs. They will do their best to find one that isn't used in your immediate area, however that will not guarantee you will not deal with interference. The frequency coordinator will charge you a fee per frequency you need. They will also assist you with filing for the license.
The FCC fee for the license is (if I recall correctly) $105 for 10 years, and you'll need to renew the license every 10 years.
Frequency coordinator will cost you a few hundred bucks.
If you want to use this as a base station, you may run into issues trying to do the itinerant license. It's not what itinerant licenses were intended for. You really want to do the coordinated license.
As for antennas, a base antenna is going to be quite large on these frequencies, so you'll need a suitable support structure for it. A good low band base antenna will run you around $1,200 for a decent one. You can go cheaper, but you'll get lower quality and frequent replacements.
Good coaxial cable designed for this sort of use will depend on how long the run is from the radio to the antenna, but figure on $2/foot, $40 per each connector, lightning protection, grounding, etc. Special tools are needed to install the connectors and it really pays off to have a professional do it for you.
For mobile use, you want a good permanently installed antenna. You'd be looking at about $80 per antenna, another $25 for the antenna mount. The mount needs a 3/4" hole in the center of the vehicle roof. Connector installation requires specific tools and skills. The antenna needs to be tuned for the frequency you get assigned and that requires specific test gear and skills.
The radio needs to be well mounted in the vehicle and powered directly off the battery.
My guess is that you'd be in around $5,000.00 to get this off the ground. The radios are the easy part.
