Ideally, a CB base antenna should be placed as high as possible. This will ensure that the signal can reach its full potential and be heard by as many people as possible. However, there are a few things to consider before placing your antenna at the highest point possible. One is that the higher the antenna is, the more likely it is to be damaged in severe weather conditions. Another thing to consider is that if the antenna is too high, it may not be able to pick up signals from all directions equally. For these reasons, it is important to find a balance between height and practicality when deciding how high to place your CB base antenna.