How to Build a 10KM Range FM Transmitter: Suitable Amplifier Circuit and Components?

I am a beginner of Electronics and a hobbyist. As a beginner FM transmitters has caught my attention. I've made few of them following the online blogs and project tutorials. They are working. I want to increase the power of the transmitter to transmit the signal to longer distance. I am looking for a 10 KM range. I am not sure of it sounds practical or not, with basic components.
I am currently referring the following circuit.
 

How can I take input from the output of the above circuit (i.e.) the antenna and amplify the FM signal power to transmit it to a wider range? I've come across VHF amplifier circuits. But most of them are really confusing and uses an obsolete RF Transistor and several inductors without much explanation. For a beginner like me, it's difficult to troubleshoot, when there is less or no explanation.
If someone could please post a link to a detailed circuit or share the circuit here, I'll be grateful.

What you would need for this is a LICENSE!  At least, that is absolutely true in the USA and most other nations.  Using a transmitter with that kind of range without approval from the FCC (in the USA) or the appropriate regulatory agency in other countries can land you in a LOT of legal trouble.  To cover 10KM would take output power (actually "effective radiated power" (ERP)) in multi-watt range; most of the circuits you can find that are considered "incidental radiators" are 100 mw or much less.  I've been a licensed radio amateur for over 60 years(and a professional RF engineer for over 50 years). It's not that hard to get a ham radio license almost anywhere (exceptions are a few nations with highly oppressive governments).

To echo Mark Rackin, "What you would need for this is a LICENSE!"In the process of getting a ham radio license, you will learn what frequency bands you are permitted to transmit on, and what content you are permitted to transmit. In the process of studying to pass the exams for the license, you will find detailed explanations of how the amplifier circuits work, and what the inductors are for.Are you desiring to transmit so ordinary FM broadcast receivers can pick up your signal? For that, you will need a broadcasting license, entirely different from an amateur radio license.I've been a licensed radio amateur for over 40 years. I expect Mark Rackin and I could compare experiences with vacuum-tube radio circuits.

In New Zealand it is possible to operate FM transmitters in the 88-108MHz range up to 25Km provided you meet a broad  set of well defined specifications, making it possible for anyone to be a broadcaster. It has been used in small communities to set up local services. FYI I have included the link to NZ's spectrum management page covering this issue.https://www.rsm.govt.nz/about-rsm/spectrum-policy/gazette/gurl/low-power-fm-broadcasting

Obviously this only applies in New Zealand, although other countries may have similar policies. The schematic supplied would not meet the specs laid down by the NZ authorities, and boosting its power definitely would not.There are, however, chip sets from IC manufacturers that would do it. The necessary test gear to make sure that the design is good is probably the biggest stumbling block for the amateur builder.Optionally, there are transmitters available at the module level,cheers,Richard