A directional receiving antenna is necessary and can be easily constructed from brass welding rods, a square wooden dowel, a connector, and some 50 ohm coax transmission line. (Use the coax with copper braid.) Make the driven element first by heating the brass rod and bending it then soldering the coax to it as shown. Make it a little long to account for the radius bend. You can trim off the extra afterward. Next insert the welding rods into holes drilled at the correct locations on the wooden dowel. Then superglue them in place. You can use plastic tie-wraps to hold the coax in place. And of course a connector is added to the other end of the coax. (Some people make the boom out of pvc instead of wood and place a T immediately after the last element to use as a handle. They then mount the receiver on the rear end of the boom.)
The following dimensions are for the 3 different modules 315mhz, 418 mhz, and 433.92 mhz and were adapted from Programming Pete's antenna construction page.
