If you are looking for max range then you have to start invasively modding things. I recommend starting simple & moving up until you get to where you want to be. Remember: the BATTERY IS YOUR ULTIMATE LIMITATION. Doesn't matter if your can control the Phantom from 25 miles away if your battery is only good for 8-10 miles. That said...
Step 1: Windsurfer. Its inexpensive, non-invasive, doesn't void warranty. Only good for control on a P3S. <$20
Step 2: One of the RC-side non-amplified kits from DBS or FVPLR. You can send in your controller & have them install the mod so when it comes back you are ready-to-fly without risking blowing the installation on your own. ~$200 installed. These non-amplified systems can work extremely well & is probably all you'll need. Extra time needed before flying installing antenna to RC unless you get a custom case to carry it assembled.
Step 3: Add RC-side amps to Step 2. Two amps on a P3 Standard, 2.4 Ghz for FPV & 5.8 Ghz for control. ~$200-$250 Your controller is now much heavier with antennas, two amps, mounting brackets, & battery to run amps. PITA for a quick flight around the park or around the house. Your friends will be thinking, "WTF?"
Step 4: Add Bird-side antenna upgrade. ~$50-150. Now your sleek & sexy Phantom has all sorts of strange antenna poking out in all directions. Generally have to remove/install before/after flight. Adds some weight/drag, reduces flight times. Bird loses that "schmexy" look.
Step 5: Add bird-side amp. ~$125. Not sure about DBS but FVPLR has a TINY bird-side amp. It is 2.4 Ghz so it only boosts FVP on a P3S. On a Pro or Advanced it would boost the entire Lightbridge signal. Special tray mount for P3. Adds weight, draws additional power.
What options are there for losing video feed?
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