The video will vary in auto mode, but it will be 720 resolution. The quality degrades only slightly when reducing the bit rate to 4mbps. You see a few more artifacts.
On a P4 the best methods to increase range in order by cost is:
Install the 32 channel hack, use ch30 (free).
Use a Windsurfer $15.
Install a DBS2 antenna with clean install kit $150.
After the kit is installed, if you're not happy, add amps and battery, $140.
Option to above:
Buy a used inspire 1 controller, $300
The Inspire controller with just a Windsurfer gets my P4 out three miles over vacant hills or water.