Since you want "Parked and traveling" I will limit to traveling (What works while traveling also works when parked).
TV you have three options, I will give the US options.
First: Over The Air, which is what I use.. Some times it does not work well, sometimes it's great. The major advantage is .. it is free (or nearly so)
I upgraded the antenna on this Motor home as follows.
1: Factory installed a Winegard Sensar II (the most common RV antenna).
2: I added the "Wingman" which just about doubles signal strength on an "on axis" UHF station (not much effect on VHF) ("On-Axis" means I'm pointed toward it).
3: I added the SENSAR PRO indoor module This makes it way easier to point the antenna, plus it includes a variable gain amplifier that improves things even more.
Result.. Basic Sensar 2 where I am now 1 station, wingman about 3, Sensar pro... About 8 and over 25 "Services"
Station (the numnber in prens is the broadcast channel, other numnber is display
2 (2) 7(41) 4 (45) and so on
Services, 2-1, 2-2, 4-1, 4-2. 7-1, 7-2, 7-3.
You do not need to know the number in prens (Well you do for aiming) because your television or digital TV converter will discover them for you and tell you what they are. As long as it's not a Vizo.
I should point out all the really good shows from the 60's 70's earlier and slightly later are on Tier 2 for the most part (N-2)
Your next two options for TV are: DISHnetwork or DirecTV (DirecHDTV) Many threads on Satellite TV, which is best.. My recommendation is to look at the packages and price, pick the service you want and then post here before ordering for further information.
INTERNET: Two choices
2-way satellit internet, Kind of slow, plus a long delay between click and response.. But nearly 100% coverage nation wide.
Cellular internet (Verizon, T-Mobile, AT&T, Sprint/Nextel, Virgin and a host of others) the first 4 are service proviers, Virgin (And the host) generally use one of them to provide service.
Speed varies, where I am now 2-way sat is way better (Dialup is better) as the phone says "G" That's Generation 1 folks about 28K if I'm lucky.
A few miles away (When I go to church) it says 4-G, That is Greased lightening What takes me hours here in the park on 2-way Sat took 45 minutes. And I was downloading a video at the same time.
The moral of this is coverage varies depending on where you are. Verizon is supposed to have the best high speed coverage. but some places I've been I had high speed (T-mobile) and they did not.
Best suggestion here is two accounts. one a "pay as you go" where you can put 10 or 20 dollars into it if you need, The other your "Regular" service.