Yes, you can use a WiFi connection with this laptop with no problems.
I don't really get how you have an antenna on your laptop, but if you do, it does not effect it.
If your laptop doesn't have Wifi included you can buy a USB Wifi adapter at any computer store. The adapter is the size of a standard USB memory stick, with the exception that it has a 802.11 chip and antenna in it. The setup is pretty simple. Simply install the driver that's included onto your laptop, plug in your adapter and your should be ready to connect! :-)
How can I improve the wifi signal strength for my laptop computer? How can I improve the wifi signal strength for my laptop computer? How can I improve the wifi signal strength for my laptop computer? How can I improve the wifi signal strength for my laptop computer? How can I improve the wifi signal strength for my laptop computer? How can I improve the wifi signal strength for my laptop computer?
There are many places where a WiFi antenna can be purchased. These include local electronics stores, computing stores and sites such as Amazon or eBay.
The fact that your other laptop can connect to wifi is irrelevant to whether or not you have disabled wifi on the laptop that is reporting that wifi is disabled. Go into your settings and make sure you haven't inadvertently turned it off.
Wifi is just wireless internet connection.
Basically yes, any laptop with wifi capability and within wifi network will work. Other factors might contribute, is the wifi has public access, can you connect your laptop to the wifi network available and might be the wifi network required certain fee access that you may or not willing to pay.
No.
The majority of laptop manufactures have incorporated Wifi in their laptops. In fact nowadays it would be difficult to buy a laptop without Wifi. Check the popular laptop manufacture websites such as Dell, HP, Compaq, Acer, Apple, Lenovo..etc to find out which laptop models include Wifi.
Depending on the make and model of the USB WiFi antenna, it can boost a WiFi signal range up to 1000 feet and some claim to boost the signal by four times whatever the current output is.
If the WiFi device is a PCI card, then it should be inserted into a PCI slot inside of a desktop computer. If the WiFi device is a PCMCIA card, then it should be inserted into a PCMCIA slot located on the side of a laptop. Finally, if the WiFi device is a USB adapter, then it should be inserted into a USB port on either a desktop or laptop computer.