There is local 10 Meter ground wave activity in some parts of the country. If you use a vertical like the A-99, you could reach stations up to around 50 miles away if they have a similar antenna. CBers on 11 Meters do it often with just 5 watts on AM or SSB.
There isn't any ground wave on 10 meters.
If CBers are working each other over 50-mile paths with 5W and an omnidirectional vertical on each end, that must be a very "flat" terrain place (Florida?). It ain't happening here.
Well I certainly don't think that those 50 mile contacts on 10 Meters are "skip"! Yes, terrain absolutely does have a great deal to do with it. As a CBer back in the day on Long Island NY (which is basically flat), I would often on quiet evenings make contacts with other stations 50 miles away on AM, and even longer distances with SSB. I was using a basic 5 watt CB unit with a half wave vertical, reaching many other stations at that distance who were using similar radios and antennas.