First when looking to set up a communication, You will need to find the largest available clear and flat area on the highest possible terrain.
Use as obvious a signal as you can create. On the other hand, you will have to be of supply fuel or power source to feed or maintain your situation.
You do not want to set up a signal, say a fire unless you can a. Light it, b. Maintain it, c. supply it.
If you are going to set up a wide game, when practicing your skills in this area of signalling, you will need to Pick an area that is visible from the air, but ensure there are hiding places nearby. Try to have a hill or other object between the signal site and the enemy Patrols to mask your signal from them. You can only do this properly if you do a thorough reconnaissance of the area to ensure there are no enemy Patrols nearby
Whatever signalling equipment or device you plan to use, know how to use it and be ready to put it into operation on short notice. If possible, avoid using signals or signalling techniques that can physically endanger you. Keep in mind that signals to your friends/Patrol may alert the other Patrols of your presence and location
A radio (CB /Clansman/Pocket WAP phone are probably the best and quickest way to let others know where you are. Become familiar with your communications equipment . Learn how to operate them and how to send and receive messages. prearranged signalling techniques may improve your chance of rescue