geodou wrote

In other words, may the antenna works as receiver and transmitter Wi-Fi simultaneously?

CPEs are either for directional point-to-point (PtP) links (CPE to CPE) or for point-to-multi-point (PtMP) links (one CPE to several other CPEs).

The CPEs don't perform very well in PtMP mode with regular devices if there is no line-of-sight to the client devices, i.e. if there is a wall in between. Reason for this is not the CPE, but your client devices (PC, laptop, tablet, smartphone), which usually have very weak antennas. But for a good connection you need good antennas also on client devices. What's more, the CPEs have an antenna beamwidth of 60°, so careful alignment is needed to create a reliable link between two CPEs or between a CPE and a client device.

So you could try it, but don't expect much improvement.

I would rather use a fiber cable with media converters on each side to make a link to my neighbor's house. This would yield a 100% reliable signal. In your house just use a regular access point with 360° omnidirectional antennas to spread the WiFi signal locally.

geodou wrote

Wich model of omnidirectional antenna have I to by?

If you link your and your neighbor's house over fiber cable and media converters, you can use any indoor access point or WiFi router you like such as the TL-WA901ND (if you just need an AP and want to share the network with your neighbor's network) or an EAP110 if you like a more stylish AP or an Archer C7 if you need a router (to separate your network from your neighbor's network). Any device with an omnidirectional antenna and an Ethernet port to connect to a media converter will fit.

You're welcome.

See this link for media converters from Ethernet copper to fiber and vice versa: http://www.tp-link.com/us/business-networking/switches/accessories

For example, if 100 Mbps is sufficient for your Internet uplink, a pair of one MC111CS and one MC112CS allows a connection from your house to your neighbor's house over a single fiber cable. Then you could connect any WiFi router or access point to one end of the link.