long range fpv choosing

what is the name of the1.3 Ghz fpv tx & rx in the market that would give me 20 km range and where to be found ? and can i add a signal booster to it?

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choosing battery

hallo ...in youtube i saw that one plane used two 5.0 amp batteries in parallel = 10000mah/10 amp , i don't know the C rating .. say it's 20 amp battery so battery amp is 10*20=200 amp ..but they connected 60 amp ESC and 45 amp brishless motor to tha

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