At 200 MHz, you should not need much power to reach 10 meters. Path loss
over 10 m at 200 MHz is a little under 40 dB. So, depending on what the minimum signal level required at
the receiver is (kTB + SNR), you can probably get away with an output power of under a watt and not need
a high power amplifier. Of course, crappy antennas can really knock down the received power.
There is a path loss calculator on this page:
The Friis equation for path loss is here: