ORIGINAL: Fastsky
I read up on the Spectrum and didn't know that the was Spectrum requires a dual reciever set up. One has to be mounted outside the fuselage if I am reading the facts right. If thats the case I would rather opt for the Polk radio which has snthethized tuning and you can pick your own channel and its futaba buddy box compatible. [8D]
The DX7 system has a one-piece dual RX set-up with both parts inside the plane. Of course you COULD put one or both outside if you wish (like on a profile) but I wouldn't. The most important part is to have the 2 antenna systems 90 degrees to each other to avoid blind spots as I understand it. In actuallity, unlike typical 72 MHz systems, NOTHING needs to show outside the plane with the possible exception of the on/off switch. No dangling antenna wires.
http://www.horizonhobby.com/Products...ProdID=SPM2710
above is the DX7 page from Horizon Hobby, lots of info pages.
And below is the COMPLETE AR7000 RX for the DX7 system
http://www.horizonhobby.com/Products...ProdID=SPM6070