Bro, let me save you a **** ton of work. I researched a lot into getting the best quality and most inexpensive FPV setup using my GoPro and P1.
From Hobbyking:
* #9425000001/28907 7 inch 800 x 480 TFT LCD FPV Monitor with LED Backlight Fieldview 777 = $79.99
* #015000123-0/49500 XT60 Male to 2 DC Jack Plug Connectors (1pc) = $3.60
* #58GHZ-RX-1/18649 SkyZone RC805 - 5.8Ghz 8 Channel AV Receiver = $18.95
* #544000002-0/65682 Skyzone TS58500 32CH 500mW Mini Video Transmitter = $36.96
* #T2200.3S.20/8932 Turnigy 2200mAh 3S 20C Lipo Pack = $9.99
From Amazon:
* BW® FPV 5.8GHz 5.8G Clover Mushroom Antenna TX/RX Set RP-SMA Female Plug(Straight inner hole)
http://amzn.com/B00SY9F5AO
Monitor Mount (this mount is fantastic, shipping took about 7 days to get to me in CA.)
* Rave Aerial Video
http://www.raveaerialvideo.com/product/dji-monitor-mount/
With everything above, you'll get about 1/4 mile range of decent video and almost 1/2 mile with pretty crummy video. Keep in mind this was in a public park in the middle of San Diego, so there was probably a lot of interference.
I upgraded my RX antenna to this one and now I get clear video all the way out until I trip my RC range limit and RTH, about 1/2 mile or a little more.
* 3.5 turn 5.8GHz Helical antenna Circular Polarization - Best for FPV - RP-SMA
http://www.ebay.com/itm/121441652460
*** The only other thing you'll need is a couple dollar balance port adapter to charge power your video TX from your on board phantom battery. I dropped by a local hobby shop and they had one for $3 and charged me another couple bucks to clean up the soldering.
Good luck.