iFly GPS Forum

My iFly 720 first, and now the 740, is mounted in the left window just behind the panel in the C182. I was worried that there wouldn't be enough sky exposure so I bought the external GPS antenna with the 720. When I upgraded to the 740, I tried it without the external antenna, and it has worked great. I don't think the external antenna helped any - your mounting position and aircraft might be different though - - -

Both the internal and external antennas use similarly spec'd WAAS receivers, so side-by-side you probably wouldn't notice a difference. If there's a lot of metal in the panel to block the signals coming in, or equipment causing interference, the external should help get around that.