Any vehicle is subjected to drag. Most of the work put into the system is used for the transportation of air. Compressing the air in front of a vehicle requires work and lots of it. We don't do anything with this compressed air. We look at it as if it's a problem and problem thinking is always focused on making something go away rather then doing something useful with it.
To keep things simple we should compare the drag with standing in the wind. There always is some wind, it never seems to have the right direction and angle but it's always there and seems to behave just like rain when you didn't bring the umbrella. Often the cyclist will find he is cycling up the wind both on his way away and on his way back. In such ideal situation it's obvious that over 220 degrees the wind is nothing but an annoyance. It barely needs to turn to annoy you in both directions.
Amazed by how little people know about sailing I feel I should mention sailing up wind works much much better as sailing down the wind. Depending on the boat the ideal angle for sailing is some place between 45 degrees down and 45 degrees up the wind.
The illustration shows the wind in red arrows the sail in green and the motion of the module is represented by the blue arrow. Using wheels rather then water a much sharper angle up the wind can be accomplished. I assume it can be useful down to 10 degrees.