Paul,
  I'm no expert on XM Weather, but it appears they use a satellite
  signal/receiver and associated s/w to display the images and information on
  a pc or palm device.Here's a snip from their web page...

  _____________________________________________________________________________
Continuously broadcast and dependable

  XM WX Satellite Weather employs a unique satellite delivery
  mechanism<http://www.xmwxweather.com/xmwx-data/to ensure constant,
  reliable weather coverage, no matter how thick the
  clouds get or how hard it rains. In fact, the quality of XM WX data, in
  addition to its robust satellite delivery, has prompted over 90% of
  airframe
  manufactures to adopt XM WX as an optional feature for their aircraft.


  _____________________________________________________________________________

  My issue is with the method of billing that requires an ongoing monthly
  subscription.As I only fly 3-4 times/month, I am looking for something
  that is either free, minimal cost, or allows a per use charge.Most of my
  flying is < 50 miles each way, but Texas weather can change very
  quickly.For now, I guess I'll use the EEE PC to get weather while still
  on
  the ground.

  Mark S.

  Back in my glass cockpit Kitplane article of 1989 I mentioned picking up
  UHF TV
  channels on a small portable 12 voltTV set for weather.

  My friend has a big motor home with a 3 foot diameter satellite dish
  he gets the internet on. I think it is Hughes. It automatically searches
  for
  and locks on to the satellite. There is a servo in it. Of course it
  automatically
  folds down on the roof of the motor home as well as well to cut the overall
  height.
  Cost about $5000 as I recall. He also has a much smaller one that does the
  same
  thing for direct TV only. Check with your local motor home dealer.

  I have a fixed direct TV satellite dish at home but it does not have
  internet service
  but it does have the weather channel 24 hours a day. The dish is about 18
  inches
  in diameter. I have a spare dish if you want one.Might fit in an Lancair
  ES rear
  fuselage. All you need is a servo to find and lock on to the satellite :)

  If they can fly a Rotax 914 poweredUAV in Afghanistan from Tamps Florida
  with a sat link surely we can get weather real time :)


  Paul Lamar

Well, if anyone knows how, I would sure be willing to listen.;-)

Mark

Next time you go flying try the 2 pound  portable 8" digital TV and see what
you can receive. I think UHF is line of sight so you might be surprised.

http://www.lcddigital.tv/8_tv-digital.html


Some television receivers have only an analog broadcast tuner and will require
a converter box after February 17, 2009, to receive over-the-air broadcasts
with an antenna because of the Nation's transition to digital broadcasting.
Analog-only TV's should continue to work as before with cable and satellite
TV services, gaming consoles, VCR's, DVD players, and similar products. For
  more information, call the Federal Communications Commission at 1-888-225-5322
(TTY:1-888-835-5322) or visit the Commissions digital television website at: www.dtv.gov

----------------------------------------------
Here is a cheaper one digital as well.

http://www.radioshack.com/product/index.jsp?productId=3324197

Paul Lamar