You can NOT just simply lengthen the antennas with out messing with the frequency they are designed to receive or transmit. In the picture that FJ posted, it looks like they simply put 100% of the existing antenna outside of the H body. On my H a good 1/4" of the antennas are inside the body. Also becareful of GAIN specs listed by antenna companies, they will list them with 2 different specifications Dbi or Dbd. They are two different ways to express gain, and they usually will use the higher number to make it look better The standard ST-16 antenna (the long one on the left. Should always be pointed straight up and down (Vertical) if you allow it to be horizontal to the aircraft you could loose up to 50% of the transmit/receive ability.