You asked for suggestions about securing your perimeter. I can offer assistance with IP based cameras if you like. Feel free to PM me for more info. (For IP based security it doesn’t matter if you have an “outside” internet line or not, if all you want to do is view from within your home).
Here is just an idea. You place a couple of these wireless cameras along the outside of your house (maybe near the entrances and big windows). Maybe even put one inside the house. I believe all the cameras I listed allow you to turn off the recording light. They use IR for night vision and have motion activated alarms (if you setup a computer monitoring station it beeps). You can record video or upload pictures (1 per second) to an internal/outside destination. You can view all the cameras via smart phone\computer within your local network or anywhere in the world if you have internet setup at your house.
For the tree line I would put POE cameras… How many would be up to you. The POE allows you deploy the cameras without worrying about an electric source. Ethernet has a max distance of about 100 meters. So you can get some cameras out there pretty far.
I listed cameras from a company I like. There are cheaper options but I do not know how well they work.
This can get pretty expensive, fast, but you could always do it in phases. If you like the idea do one or 2 on the outside of the house and next year put one in the trees.
Wireless cameras for around the house. These cameras are wireless so all you will need is electric.
Wireless Camera Options:
Wireless Outdoor Camera (does not look around):
Amazon.com: Foscam FI8904W Outdoor Wireless/Wired IP Camera with 15-20 Meter Night Vision and 6mm Lens (67° Viewing Angle) - Silver: Camera & Photo
Wireless pan/tilt/move (this camera can look around, but you will need to buy Outdoor Housing & External IR light if you put them outside) (they come in black or white): Amazon.com: Genuine Foscam Fi8908w Wireless Ip Camera Network with Pan & Tilt,night Vision,2 Way Audio,black: Electronics
Outdoor Housing & External IR light: (from a distance the housings look like light fixtures)
Waterproof Outdoor Enclosure Dome Clear Case For Foscam IP Camera US Stock on eBay!
Amazon.com: 48-led Illuminator Light Cctv Ir Infrared Night Vision: Electronics
Now for a perimeter I would do POE (power over ethernet) cameras:
What POE gives you is power over the Ethernet cable, so all you have do it is run the 1 cable. IMO, it’s much easier to string up some CAT 5 than worry about getting some electric way up in a tree. The way it works is you use the injector (listed below) to send some power through the line and just run the line to the tree or post you have stationed on your perimeter. You probably have phone/electric/internet lines running to your house already, you can disguise this one leaving your house by exiting near those cables. Or you can bury the cable if that makes more sense.
Pan/Tilt (Again, you would need the housing & IR light) (they come in black or white):
Amazon.com: Foscam FI8918E PoE Pan & Tilt IP/Network Camera with 8 Meter Night Vision and 3.6mm Lens (67° Viewing Angle) - White: Camera & Photo
Outdoor camera:
Amazon.com: Foscam FI8905E Power Over Ethernet Outdoor IP Camera with 6 mm Lens, Night Vision Up To 30 Meters: Camera & Photo
Networking equipment:
A little explanation on the networking equipment: What this wireless router will allow you to do is create a Local Area network for your home. It will allow all the cameras to communicate with viewing computers\ smart phones that are on the same network. Now if you have an internet connection at the house you can view the security camera from any smart phone or internet connected computer. All you need to do is adjust the firewall on the router a little. If you already have a wireless router you can probably use that (assuming it has some basic firewall port forwarding)
Wireless Router (1 total):
Amazon.com: TP-Link TL-WR841ND 300Mbps Wireless N Router: Electronics
POE injector (1 per POE camera):
Amazon.com: TP-Link AC TL-PoE150S PoE Injector: Electronics
Outdoor Ethernet cable (1 per POE camera):
Amazon.com: 100ft Cat6 Outdoor Waterproof Ethernet Cable Direct Burial 100 ft (600 MHZ) Shielded: Computers & Accessories
Phase 1: Example setup (assuming you need everything):
Router $ 32
Wireless Outdoor camera: $95
Wireless Pan/Tilt Camera (placed inside the house looking out a window): $80
A computer that will always be displaying/recording/alerting (completely optional): $200
Dell Latitude D820 Laptop Core Duo DVD/CDRW XP WiFi 15.4 LCD Notebook Computer 837654219140 | eBay
Done. You have 2 cameras watching your house with a dedicated recording monitoring station. Add/ Modify as needed.
Phase 2: if needed add a pan/tilt camera to the exterior of the house… Or throw a POE camera in the tree line.
I think the computer might be over kill. You can always just have it upload pictures on movement to a folder on your current computer, so you have them saved… And you can flip open your phone can check out the cameras whenever you want. I have no idea but you might be able to lower your insurance if you tell them you have security cameras