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i do believe it is, feasable, but best i think, would be to have a few devices to bridge the gape, if your jest using wifi, i dont know about uhf or vhf, was thinking on laser communications, a long while back, actualy made a prototype repeater, witch might be feasible, using the arduino micro, of witch i have but have yet to play around with, there are wifi add ons of witch you might be able to plug 2 of them in and use some sort of small solar panel and hi capacity battery to do the trick, along with directional antena, hope this helps, as im interested in this as well
Here's what a quick Google search yielded. You may find some good information here:
But just me thinking, you'll probably have to have a few repeaters to get the signal to the receiver since it's not line of sight per say.
knightfallx66:
I just wanted to quickly ask about the feasibility of communicating between two Arduino devices or an Arduino and a PC at a range of greater than 100 miles without using the internet. I am somewhat new to Arduino and even less experienced with radio communication, but I assume there is some form of AM, UHF, or VHF method to communicate at such a distance. Could someone with technical knowledge enlighten me on if this is possible at all and if so, how I might accomplish such a task?
Ham radio RTTY?
Are you a licensed radio amateur with an offical call sign in your country?
Most commercial radio stations with thousands of watts of transmitter power go about 100 miles. With directional antennas and no obstructions or interference you can get by with less power.
You might try a ham radio forum. Those guys will know all the tricks and regulations. Ham radio operators communicate with people all over the world, but I believe the atmospheric conditions need to be "just right".
Transmitter regulations will vary by country. In the U.S., a ham radio operator needs a license (probably depending on transmitter power).
knightfallx66:
I am not, but have considered it. Would Ham Radio be a workable option?
Yes, ham radio is possible on different frequencies as well as in different operating modes.
While more than 100 miles might not be possible with weak transmitting power and at every time of the day, at least there should be frequencies that will work in the evening hours fairly reliable for more than 100 miles with transmitters that provide decent transmitting power.
Perhaps ask your question in a ham radio amateur forum, where the ham radio experts are discussing.
What about using mobile broadband - a dongle at each end. Or just sending SMS messages.
I suspect that it will be difficult to get reliable communication with any other method - especially if you are not already a Ham radio expert.
...R
Could someone with technical knowledge enlighten me on if this is possible at all and if so, how I might accomplish such a task? Thanks in advance.
If it was cheap and easy, you would already see thousands of people controlling their drones and similar bots over such distances. You might be able to use the telephone cellular systems in some way, but could be costly or not fit your needs.
VHF and UHF radio generally rely on line of sight propagation.
At these frequencies the radio horizon is only just beyond the visual horizon.
To get a longer range you need to have your antenna at a elevated height.
Also the signal strength will fall off according to an inverse square law.
That means that you will need a high powered transmitter.
So, if you combine these two factors, you will find that in order to achieve the range you require, you would need something like this.
It is clearly not feasible for an individual to do anything on this scale.
VHF and above frequencies are indeed "line of sight" frequencies, which in practise means horizon, which again means about 3 miles (when you're on the ground at least).
I'm fairly pessimistic regarding the decameter band as well, given its sometimes temperamental nature (You can only get range at night, sunspots get to decide if you're having a good or bad day, etc, etc). Also the legality of data transmission would need investigation. And then of course there's the licensing. And the equipment.
You can use ham radio satellites to get a longer distance but they only come round about two to four times a day so it is restricted to that.
Then you can use moon bounce, that requires high power and both stations being able to "see" the moon so restricted to a maximum of 12 hours a day.
In the 70cm band you have the bandwidth for a video transmission and 100 miles is possible with directional antenna and a good location at both ends.
Otherwise commercially there are ISPs that use satellite or meshed RF networks. Finally there is always the cell phone system.
( I am a Radio Ham )
Grumpy_Mike:
In the 70cm band you have the bandwidth for a video transmission and 100 miles is possible with directional antenna and a good location at both ends.
Not if you're in Europe - low power (10mW) voice transmission only, as it falls under LPD433.
Not if you're in Europe
Well I am in the UK and I have transmitted video in the 70cm band.
as it falls under LPD433.
Rubbish, that is the license free band not the ham radio band.
From the RSGB band plan
435.000 – 438.000MHz All Modes – Amateur Satellite Service – Fast Scan Television
Yes, that was kind of the point - if the OP doesn't have much experience with radio communication, I doubt he has a ham license.
Yes but he said he was thinking of getting one. We all have to start somewhere.
Ohh.. I missed that bit. Apologies. 
The only viable way to do this reliably in the absence of any other telco services such as mobile phones is to use
an Iridium Satellite phone at each end .
Will work anywhere in the world, but is extremely expensive both in the costs of the handsets and the cost of the data.
It would also help if the OP indicated how much data needed to be sent and at what speed.
I guess you need to think a bit more about what communication you are planning. Is it one way transmission, or will the remote also need to transmit? How much data and and does it have a time value, meaning real-time or just telemetry? Will you have exclusive control of access to both sites?
Telemetry from remote sites has been done for many decades using reflections from meteor trails using VHF, but this is commercial equipment and dedicated frequencies. This data may be hours old before the central site receives all of the data. Would this be a problem for you?
VHf communications is much more dependent on antennas and low noise receivers than transmitter power. The 100 miles you are considering needs to be defined better. Flat land or mountains? I am able to communicate on 144.200 MHz way more than 100 miles with a big antenna and bouncing the signal off mountains.
Another consideration of using amateur radio is the legality of one-way transmission and unattended transmitters.
Have you investigated using one of the dedicated RC, radio control, bands? There may be power limits, but nice, large antennas, and flat landscape might get you 100 miles. All subject to interference, of course.
My 2 cents worth.
Paul, KD7HB