If you are using the little dipole antennas, you can increase efficiency by shortening the coax instead of folding or coiling the extra. If you disassemble the antenna end, the coax shield (braid) is connected to one radial and the center conductor to the other. Unsolder, cut coax to more appropriate length, resolder (use heat sink [hemostats etc] on braid when soldering it to avoid heat damage to coax insulator).

bumper