Range

Be aware of range and how far out you are likely to fly your plane. This is
partially a function of how big your field is and what you are flying.

Here are some thoughts:

Indoor flyers will no likely exceed 500 feet and 300 is probably enough.

Slow flyers, small parkflyers, say speed 300 class and below, are probably OK
with 500-1000' range

For two meter sailplanes and larger faster parkflyers above the 300 class, as
well as small to medium size glo planes, half a mile/2500 feet, would probably
be OK. The sailplanes tend to get high and the others are fast enough to eat
up ground quickly.

For larger glo planes, 3 meter plus sailplanes you want the 1 mile class of
equipment.

There is no such thing as having equipment with too much range, but a three
meter sailplane can exceed a half mile transmitter because it is large enough
to be easily flown that far away. You don't want to be flying at the edge of
your equipment's range. Weak batteries, interference and such can shorten the
range resulting in you losing control when you seem to be with the working
range of your equipment, so when in doubt, bump it up some.

AM, FM, 72 MHZ and 27 MHZ do not directly impact radio working range, though
there are typical ranges for each, so be aware of it. Depending on the
specific equipment:

27 mhz airplane radios are typically 500-2500 feet.

AM about 1000-3000' feet.

FM/PCM/PPM are offered all across the range board from

300 feet to over a mile depending on the equipment.