Well, first, there is no such thing as a 75 meter 'CB' band. There is a 75 meter Ham band though.
What would be a good antenna to use at about 3.850 Khz? One that is resonant would be very nice. All kinds of shapes that sort of antenna can be made in, probably the biggest difference would be if it's vertical or horizontal. Most 75 meter antennas are going to be large/long, some thing between 65 feet and 130 feet, depending on that vertical/horizontal thing. That can be shortened by 'loading' that antenna, using coil(s) in it. But that 'shortening' has limits.
As far as hearing your own signal, an echo, good luck. Certainly not impossible under the right circumstances, but those circumstances are few and far between.
that help any?
- 'Doc